An up and down blitz game

[Look]

Hi,

i kibitzed the following game online:

[pgn]
[Event "Rated Blitz game"]
[Site "https://lichess.org/EBuhShf9"]
[Date "2017.11.11"]
[Round "-"]
[Result "0-1"]
[UTCDate "2017.11.11"]
[UTCTime "05:53:53"]
[WhiteElo "2564"]
[BlackElo "2345"]
[WhiteRatingDiff "-17"]
[BlackRatingDiff "+17"]
[Variant "Standard"]
[TimeControl "180+0"]
[ECO "B07"]
[Opening "Pirc Defense #5"]
[Termination "Normal"]
[Annotator "lichess.org"]

1. e4 d6 2. d4 { B07 Pirc Defense #5 } c6 3. c4 Nf6 4. Nc3 Bg4 5. Be2 h5 6. h3 Bxe2 7. Qxe2 e5 8. d5 Be7 9. Nf3 Na6 10. O-O Nc5 11. b4 Ncd7 12. Be3 cxd5 13. cxd5 a6 14. Nd2 h4 15. Rac1 Rc8 16. a4 Nh5 17. a5 Bg5 18. Na4 Nf4 19. Bxf4 Bxf4 20. Rfd1 Rh6 21. Rxc8 Qxc8 22. Nf3 Qd8 23. Nb2 Rg6 24. Nd3 Kf8 25. Nxf4 exf4 26. Rc1 Qf6 27. Rc7 Ne5 28. Rxb7 Nxf3+ 29. Qxf3 Qa1+ 30. Kh2 Qf1 31. b5 Rg3 32. bxa6 Rxf3 33. a7 g6 34. a8=Q+ Kg7 35. Qe8 Rxh3+ 36. Kxh3 Qh1+ 37. Kg4 Qxg2+ 38. Kxh4 Qxf2+ 39. Kg5 Qg3# { Black wins by checkmate. } 0-1
[/pgn]

Several interesting positions happened in the game. You may post your analysis of them here.

[Dann Corbit]

Game progressed with white building up an advantage of about a pawn up to this point where Nb5 would have given a advantage of about a piece:
[d]2rqk2r/1p1n1pp1/p2p4/P2Pp1bn/1P2P2p/2N1B2P/3NQPP1/2R2RK1 w k - acd 30; acs 37; bm Nb5; c3 "Na4"; ce 286; pm Nb5; pv Nb5 Be7 Na7 Rb8 Rc3 Nf4 Bxf4 exf4 Rfc1 O-O Rc8 Rxc8 Rxc8 Qxc8 Nxc8 Rxc8 b5 axb5 Qxb5 Nc5 Nb3 Bf6 Nxc5 Rxc5 Qb6 Be5 Qd8+ Kh7 Qxh4+ Kg8 Qd8+ Kh7 f3 f6 Kh2 f5 exf5 Rxd5 Qh4+ Kg8 Qe7 Rc5 Qxb7 Rxa5 Qe7 Ra3 Qc7;

Advantage built slowly until nearly a rook where a checkmate sequence was missed here:
[d]5k2/1p1n1pp1/p2p1qr1/P2P4/1P2Pp1p/5N1P/4QPP1/2R3K1 w - - acd 35; acs 228; bm Rc8+; c3 "Rc7"; ce 32740; pm Rc8+; pv Rc8+ Ke7 Qc4 Nc5 bxc5 Kd7 cxd6 Qxd6 e5 Qc6 dxc6+ Kxc8 Nd4 bxc6 Qxf7 c5 Qxg6 cxd4 Qc6+ Kd8 Qb7 f3 e6 Ke8 Qd7+ Kf8 Qf7+;

A big advantage grew larger and larger for white until here:
[d]5k2/1R3pp1/p2p2r1/P2P4/1P2Pp1p/5Q1P/5PPK/5q2 w - - acd 29; acs 65; bm e5; c3 "b5"; ce 32718; pm e5; pv e5 Qc4 Qh5 Rxg2+ Kxg2 Qxd5+ Qf3 Qe6 Rb8+ Ke7 Qb7+ Qd7 exd6+ Kxd6 Qxa6+ Ke7 Qe2+ Kf6 Rb6+ Kg5 Rb5+ f5 Qg4+ Kf6 Rb6+ Kf7 Qg6+ Kf8 Rb8+ Ke7 Qxg7+ Kd6 Rb6+ Qc6+ Rxc6+ Kxc6 a6 f3+ Kxf3 Kb5 a7 Kxb4 a8=Q Kb3 Qd4 Kc2 Qa2+ Kc1 Qdd2+;
where a checkmate sequence was missed. The move played b5 lead to a drawn position we see here, which continued for some time:

[d]5k2/1R3pp1/p2p2r1/PP1P4/4Pp1p/5Q1P/5PPK/5q2 b - - acd 23; acs 0; bm Rg3; c3 "Rg3"; ce 0; pm Rg3; pv Rg3 Rxf7+ Ke8 Rf8+ Ke7 Rf7+ Ke8;

Then at this point, black blunders from a drawn position into a mate sequence:
[d]5k2/PR3pp1/3p4/P2P4/4Pp1p/5r1P/5PPK/5q2 b - - acd 26; acs 0; bm Kg8; c3 "g6"; ce 0; pm Kg8; pv Kg8 a8=Q+ Kh7 Qc8 Qxf2 Qg4 Qg3+ Kg1 Qe1+ Kh2 Qg3+;
by playing g6 instead of Kg8.

So here we see white again with a mate sequence:
[d]5k2/PR3p2/3p2p1/P2P4/4Pp1p/5r1P/5PPK/5q2 w - - acd 23; acs 0; bm a8=Q+; c3 "a8=Q+"; ce 32750; pm a8=Q+; pv a8=Q+ Kg7 Qa7 Kg8 Qd4 Rb3 Rxb3 Kh7 Rb8 Kh6 Qf6 Qxg2+ Kxg2 f3+ Kxf3 Kh5 Rh8+;

up to here, where white blunders:
[d]Q7/1R3pk1/3p2p1/P2P4/4Pp1p/5r1P/5PPK/5q2 w - - acd 23; acs 0; bm Qa7; c3 "Qe8"; ce 32752; pm Qa7; pv Qa7 Kg8 Qd4 Rb3 Rxb3 Kh7 Rb8 Kh6 Qf6 Qxg2+ Kxg2 f3+ Kxf3 Kh5 Rh8+;
By playing Qe8 instead of Qa7

So here we see black can gain the draw again:
[d]4Q3/1R3pk1/3p2p1/P2P4/4Pp1p/5r1P/5PPK/5q2 b - - acd 23; acs 0; bm Rxh3+; c3 "Rxh3+"; ce 0; pm Rxh3+; pv Rxh3+ gxh3 Qxf2+ Kh1 Qf1+ Kh2 Qf2+;

until white blunders by playing Kxh3 instead of gxh3, going from a drawn position:
[d]4Q3/1R3pk1/3p2p1/P2P4/4Pp1p/7r/5PPK/5q2 w - - acd 23; acs 0; bm gxh3; c3 "Kxh3"; ce 0; pm gxh3; pv gxh3 Qxf2+ Kh1 Qf1+ Kh2 Qf2+;

To this position where black is winning:
[d]4Q3/1R3pk1/3p2p1/P2P4/4Pp1p/7K/5PP1/5q2 b - - acd 17; acs 0; bm Qh1+; c3 "Qh1+"; ce 32760; pm Qh1+; pv Qh1+ Kg4 Qxg2+ Kxf4 Qxf2+ Kg4 Qg3+;

At that point, black played the mate sequence perfectly and won.

Game as Epd records:

Code: Select all

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - acd 53; acs 4579200; bm d4; c0 "e4"; c2 "perft 1 20 perft 2 400 perft 3 8902 perft 4 197281 perft 5 4865609 perft 6 119060324"; c3 "e4"; c4 "c4"; cce 38; ce 24; id "Fundamental Opening Position"; pm e4 {2379495} d4 {1725526} Nf3 {483679} c4 {479713} g3 {39820} f4 {35589} b3 {27764} Nc3 {13010} e3 {2686} b4 {2458} g4 {2450} c3 {1654} d3 {1649} a3 {1150} h3 {717} a4 {552} h4 {425} f3 {363} Nh3 {82} Na3 {28}; pv d4 Nf6 c4 e6 Nf3 b6 a3 Bb7 Nc3; white_wins 1826279; black_wins 1425008; draws 1430947; Opening Fundamental opening position; 
rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - acd 48; acs 212911; bm e6; c0 "d5"; c3 "d6"; c4 ""; cce -38; ce -16; id "es-dc-neutral.0005"; pm c5 {1218905} e5 {412609} e6 {257916} c6 {204175} d5 {78062} d6 {71821} g6 {57457} Nf6 {46929} Nc6 {20542} b6 {4882} a6 {1853} g5 {987} h6 {878} a5 {501} h5 {447} Na6 {410} f6 {336} f5 {276} Nh6 {273} b5 {241}; pv e6 d4 d5 Nd2 c5 Ngf3 Nf6 exd5 exd5 Bb5+ Bd7 Bxd7+ Nbxd7 O-O Be7 dxc5 Nxc5 Nb3 Nce4 Nfd4 O-O Nf5 Re8 Nxe7+ Rxe7 Nd4 Rc8 Re1 Nd6 Rxe7 Qxe7 Bf4 a6 Bxd6 Qxd6 c3 g6 g3 Ne4 Kg2 Qb6 Qb3 Qxb3; white_wins 874667; black_wins 685852; draws 642462; Opening ECO:B00; Opening: King's pawn opening; 1. e4 *; 
rnbqkbnr/ppp1pppp/3p4/8/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - acd 41; acs 3398; bm d4; c3 "d4"; cce 61; ce 30; pm d4 {67446} Nc3 {2035} Nf3 {765} f4 {739} g3 {275} c4 {207} Bc4 {162} d3 {78} Bb5+ {33} a4 {26} c3 {19} b3 {15} Ne2 {6} Qf3 {4} f3 {4} Be2 {3} Nh3 {2} h4 {2}; pv d4 Nf6 Nc3 e5 dxe5 dxe5 Qxd8+ Kxd8 Bd2 Bd6 O-O-O Nc6 Nf3 h6 Bc4 Be6 Bxe6 fxe6 Ne1 b6 h4 Kc8 Nd3 Nh5 Ne2 a5 a4 Kb7 b3 Rhf8 Bc3 Rf7 f3 Nf4 Nexf4 exf4 h5 e5 Kd2 Rff8 Ke2 Rfe8 Bb2 Rf8 c3 Rad8; white_wins 28264; black_wins 18856; draws 21904; Opening ECO:B07a; Pirc; 1.e4 d6 *; 
rnbqkbnr/ppp1pppp/3p4/8/3PP3/8/PPP2PPP/RNBQKBNR b KQkq - acd 40; acs 3399; bm Nf6; c3 "c6"; cce -63; ce -38; pm Nf6 {67048} g6 {14936} e5 {647} c6 {599} Nd7 {540} f5 {389} Nc6 {201} e6 {173} c5 {160} a6 {49} d5 {23} a5 {21} h6 {18} Qd7 {15} b6 {7} Bd7 {6} Bg4 {6} f6 {3} g5 {3} Na6 {2} Be6 {1} Kd7 {1} b5 {1} h5 {1}; pv Nf6 Nc3; white_wins 33708; black_wins 22113; draws 26018; Opening ECO:B07d; Pirc: 2.d4; 1.e4 d6 2.d4 *; 
rnbqkbnr/pp2pppp/2pp4/8/3PP3/8/PPP2PPP/RNBQKBNR w KQkq - acd 37; acs 5580; bm c4; c3 "c4"; cce 82; ce 48; pm Nc3 {910} Nf3 {549} c4 {261} f4 {135} Bd3 {76} c3 {47} Be2 {37} Be3 {12} g3 {12} d5 {10} Bc4 {7} a4 {4} e5 {4} Bg5 {2} Nd2 {2} h3 {2} Bf4 {1} Ne2 {1} f3 {1}; pv c4 d5 exd5 cxd5 Nc3 Nf6 Bg5 dxc4 Bxc4 e6 Nf3 Be7 O-O Nc6 Re1 O-O Rc1 Nd5 Bxe7 Ncxe7 Ne5 Bd7 Bxd5 exd5 Qb3 Bc6 Nxc6 bxc6 Qc2 Re8 Na4 Qd6 Nc5 Qg6 Qxg6 Nxg6 Rxe8+ Rxe8 Nd3 Re2 Rxc6; white_wins 960; black_wins 592; draws 443; Opening ECO:B07d; Pirc: 2.d4 c6; 1.e4 d6 2.d4 c6 *; 
rnbqkbnr/pp2pppp/2pp4/8/2PPP3/8/PP3PPP/RNBQKBNR b KQkq - acd 34; acs 863; bm Nf6; c3 "Nf6"; cce -64; ce -52; pm e5 {153} Nf6 {135} Nd7 {124} g6 {76} Qc7 {53} f5 {4} Na6 {2} Qb6 {2} e6 {2} Qa5+ {1} d5 {1}; pv Nf6 Nc3; white_wins 241; black_wins 162; draws 142; 
rnbqkb1r/pp2pppp/2pp1n2/8/2PPP3/8/PP3PPP/RNBQKBNR w KQkq - acd 34; acs 63; bm Nc3; c3 "Nc3"; cce 74; ce 55; pm Nc3 {131} Bd3 {4}; pv Nc3 e5 Nf3 Nbd7 Be2 Be7 O-O O-O Be3 Re8 d5 Ng4; white_wins 60; black_wins 38; draws 34; 
rnbqkb1r/pp2pppp/2pp1n2/8/2PPP3/2N5/PP3PPP/R1BQKBNR b KQkq - acd 34; acs 785; bm e5; c3 "Bg4"; cce -95; ce -56; pm e5 {332} Nbd7 {152} g6 {73} Qc7 {28} Qa5 {21} Na6 {10} Qb6 {4} a6 {3} e6 {3} Bg4 {2} c5 {1} d5 {1}; pv e5 Nf3 Nbd7 Be2 Be7 O-O O-O h3 Qb6 b3 Qc7 Be3 Rd8 Re1 Nf8 Qd2 Ne6 d5 Nf8 a3 Ng6 Red1 Bd7 Rdc1 h6 Ne1 Nh4 Nd3 Rdc8 f4; white_wins 292; black_wins 162; draws 156; 
rn1qkb1r/pp2pppp/2pp1n2/8/2PPP1b1/2N5/PP3PPP/R1BQKBNR w KQkq - acd 23; acs 2; bm f3; c3 "Be2"; ce 91; pm f3; pv f3 Bc8 Be3 e5 d5 Be7 Bd3 Nh5 Nge2 Na6 O-O O-O Qd2 Nb4 Bb1 Bd7 a3 Na6 Bc2 h6 f4 exf4 Nxf4 Nxf4 Bxf4 Bg5 Bxg5 Qxg5 Qxg5;
rn1qkb1r/pp2pppp/2pp1n2/8/2PPP1b1/2N5/PP2BPPP/R1BQK1NR b KQkq - acd 23; acs 4; bm Bxe2; c3 "h5"; ce -80; pm Bxe2; pv Bxe2 Ngxe2 Nbd7 O-O e5 b3 a6 Be3 Ng4 Bd2 Qh4 h3 Ngf6 f3 Be7 Be3 O-O Rc1 Rac8 d5 Rfe8 Qd3 Qh5 Rcd1 Qg6 dxc6 bxc6;
rn1qkb1r/pp2ppp1/2pp1n2/7p/2PPP1b1/2N5/PP2BPPP/R1BQK1NR w KQkq - acd 23; acs 6; bm f3; c3 "h3"; ce 125; pm f3; pv f3 Bd7 f4 e5 Nf3 exd4 Qxd4 Na6 Be3 Qe7 O-O-O c5 Qd3 Bc6 e5 Ng4 Nd5 Bxd5 cxd5 c4 Qc3 Nxe3 Qxe3 b5 e6 Nb4 a3 Nd3+ Kb1;
rn1qkb1r/pp2ppp1/2pp1n2/7p/2PPP1b1/2N4P/PP2BPP1/R1BQK1NR b KQkq - acd 23; acs 4; bm Bxe2; c3 "Bxe2"; ce -95; pm Bxe2; pv Bxe2 Qxe2 e5 Nf3 Nbd7 O-O Be7 Be3 O-O Rad1 Qa5 Rb1 g6 b4 Qc7 Rfc1 exd4 Bxd4 a5 b5 Rae8 bxc6 bxc6 Ng5;
rn1qkb1r/pp2ppp1/2pp1n2/7p/2PPP3/2N4P/PP2bPP1/R1BQK1NR w KQkq - acd 23; acs 2; bm Ngxe2; c3 "Qxe2"; ce 93; pm Ngxe2; pv Ngxe2 e5 O-O Nbd7 Be3 Be7 b3 O-O Qc2 exd4 Nxd4 Re8 Rad1 g6 f4 Bf8 f5 Qe7 Bg5 Qe5 Nf3 Qc5+ Rf2 Bg7;
rn1qkb1r/pp2ppp1/2pp1n2/7p/2PPP3/2N4P/PP2QPP1/R1B1K1NR b KQkq - acd 23; acs 2; bm e5; c3 "e5"; ce -86; pm e5; pv e5 Nf3 Nbd7 O-O g6 Rd1 Qc7 Bg5 Be7 d5 cxd5 exd5 O-O a4 Rfc8 b3 a6 Qe3 Bf8 Re1 Re8 Qd2 Rac8 Rad1 Bg7;
rn1qkb1r/pp3pp1/2pp1n2/4p2p/2PPP3/2N4P/PP2QPP1/R1B1K1NR w KQkq - acd 23; acs 4; bm Nf3; c3 "d5"; ce 86; pm Nf3; pv Nf3 Nbd7 O-O Be7 Be3 O-O Rfd1 Qc7 a4 exd4 Nxd4 Rfe8 a5 a6 Bf4 Bf8 f3 g6 Qd2 Ne5 b3 Bg7 Bg3 Rab8 Nc2;
rn1qkb1r/pp3pp1/2pp1n2/3Pp2p/2P1P3/2N4P/PP2QPP1/R1B1K1NR b KQkq - acd 23; acs 4; bm Nbd7; c3 "Be7"; ce -64; pm Nbd7; pv Nbd7 Nf3 cxd5 exd5 Be7 O-O O-O Be3 a6 Nd2 b5 b3 Qa5 Qd3 Qc7 Rfc1 Nc5 Qc2 Rab8 Rab1 b4 Na4 Nxa4 bxa4;
rn1qk2r/pp2bpp1/2pp1n2/3Pp2p/2P1P3/2N4P/PP2QPP1/R1B1K1NR w KQkq - acd 23; acs 0; bm Nf3; c3 "Nf3"; ce 73; pm Nf3; pv Nf3 O-O Be3 cxd5 cxd5 Qa5 O-O Qa6 Qc2 Rc8 a4 Nbd7 Qb1 Qa5 Nd2 Nh7 b4 Qd8 Rc1 Bg5 Qd3 Bxe3 Qxe3 a6 Nf3 Qe7 Kh1 Nhf6 a5;
rn1qk2r/pp2bpp1/2pp1n2/3Pp2p/2P1P3/2N2N1P/PP2QPP1/R1B1K2R b KQkq - acd 23; acs 5; bm O-O; c3 "Na6"; ce -84; pm O-O; pv O-O Be3 Nbd7 O-O a6 Rfc1 cxd5 cxd5 Rc8 Rc2 Nh7 Rac1 g6 Qd2 Nhf6 Qd3 Nh7 Ne2 Rxc2 Qxc2 Ng5 Nd2 f5 exf5;
r2qk2r/pp2bpp1/n1pp1n2/3Pp2p/2P1P3/2N2N1P/PP2QPP1/R1B1K2R w KQkq - acd 23; acs 7; bm Be3; c3 "O-O"; ce 102; pm Be3; pv Be3 cxd5 cxd5 Qa5 Nd2 O-O a3 Rfc8 O-O Qd8 a4 g6 Rfc1 Nd7 Rab1 Nb4 Qb5 a5 Nc4 Qc7 Ne2 Na2 Nb6 Nxc1 Rxc1 Nc5 f3 f5 Nxc8 Rxc8 exf5 gxf5 Ng3;
r2qk2r/pp2bpp1/n1pp1n2/3Pp2p/2P1P3/2N2N1P/PP2QPP1/R1B2RK1 b kq - acd 23; acs 3; bm Nc5; c3 "Nc5"; ce -91; pm Nc5; pv Nc5 b4 Ncd7 Rb1 a5 dxc6 bxc6 b5 Qc7 Bg5 O-O bxc6 Qxc6 Nd5 Rfe8 Nd2 g6 Nxe7+ Rxe7 Rb5 Ree8 Rc1 a4 Qe3 Rac8;
r2qk2r/pp2bpp1/2pp1n2/2nPp2p/2P1P3/2N2N1P/PP2QPP1/R1B2RK1 w kq - acd 23; acs 4; bm Rd1; c3 "b4"; ce 96; pm Rd1; pv Rd1 cxd5 exd5 a6 b4 Ncd7 Be3 Qc7 Rac1 O-O Nd2 Qb8 a3 Rc8 Nce4 b5 Bg5 bxc4 Bxf6 Nxf6 Nxf6+ Bxf6 Rxc4 Qb7 Ne4 Rxc4 Qxc4;
r2qk2r/pp2bpp1/2pp1n2/2nPp2p/1PP1P3/2N2N1P/P3QPP1/R1B2RK1 b kq - acd 23; acs 2; bm Ncd7; c3 "Ncd7"; ce -90; pm Ncd7; pv Ncd7 Be3 O-O Rab1 a5 dxc6 bxc6 b5 Qc7 Rfc1 Rfc8 a4 g6 Nd2 Rab8 Nb3 Ra8 Rb2 Qb7 Qd3 Qc7 Bg5 Bf8 Qe3 Nh7 Bh6;
r2qk2r/pp1nbpp1/2pp1n2/3Pp2p/1PP1P3/2N2N1P/P3QPP1/R1B2RK1 w kq - acd 23; acs 5; bm a4; c3 "Be3"; ce 82; pm a4; pv a4 a5 dxc6 bxc6 b5 Qc7 Be3 O-O Rfd1 g6 Rac1 Rfe8 Ng5 Rac8 Qf3 Qb7 Rd3 Rf8 Qd1 Kg7 Qd2 Qc7 Qa2 Rb8 Rcd1 Nb6 Nf3 Nfd7;
r2qk2r/pp1nbpp1/2pp1n2/3Pp2p/1PP1P3/2N1BN1P/P3QPP1/R4RK1 b kq - acd 23; acs 5; bm g6; c3 "cxd5"; ce -90; pm g6; pv g6 a4 a5 dxc6 bxc6 b5 Qc7 Rac1 O-O Nd2 Nb6 g3 Nfd7 Nb3 Rfe8 Kg2 Kg7 Rfd1 Qb7 Qd3 Reb8 f4 c5 Nd2 exf4 gxf4;
r2qk2r/pp1nbpp1/3p1n2/3pp2p/1PP1P3/2N1BN1P/P3QPP1/R4RK1 w kq - acd 23; acs 3; bm cxd5; c3 "cxd5"; ce 102; pm cxd5; pv cxd5 O-O Nd2 a5 Rfb1 Rc8 Nb5 axb4 Rxb4 Qa5 a3 Qa6 a4 Bd8 Nb3 Be7 Qb2 Bd8 Rc1 Rxc1+ Qxc1 Nb6 Qc2 Nxa4 Nxd6 Qxd6 Rxa4 Bb6;
r2qk2r/pp1nbpp1/3p1n2/3Pp2p/1P2P3/2N1BN1P/P3QPP1/R4RK1 b kq - acd 23; acs 6; bm a6; c3 "a6"; ce -121; pm a6; pv a6 Rfc1 Rc8 a4 Rc7 Nd2 O-O a5 Qb8 Nc4 Rfc8 Na4 Nxe4 Bb6 Nxb6 axb6 Rxc4 Rxc4 Nf6 Rac1 Rxc4 Qxc4 Qe8 Qc7 Qxa4 Qxe7 Qd7 Qxd7 Nxd7 Rc8+ Kh7 Rc7;
r2qk2r/1p1nbpp1/p2p1n2/3Pp2p/1P2P3/2N1BN1P/P3QPP1/R4RK1 w kq - acd 23; acs 2; bm Rfc1; c3 "Nd2"; ce 103; pm Rfc1; pv Rfc1 O-O a4 Rc8 a5 Ne8 Qd3 g6 b5 axb5 Qxb5 Rb8 Na4 Nef6 Nd2 Rc8 f3 Rxc1+ Rxc1 Qb8 Nc4 Qa8 Kf2 Kg7 Nab6 Qd8 Kg1 Rh8 Bf2 h4;
r2qk2r/1p1nbpp1/p2p1n2/3Pp2p/1P2P3/2N1B2P/P2NQPP1/R4RK1 b kq - acd 23; acs 1; bm O-O; c3 "h4"; ce -108; pm O-O; pv O-O a4 g6 Bh6 Re8 Rfc1 Nh7 Nc4 Nb6 Na5 Rb8 b5 Nd7 Nc4 Nc5 Rab1 Rc8 a5 Bg5 Bxg5 Nxg5 f3 f6 Qc2 Qe7 Rb4 Nd7;
r2qk2r/1p1nbpp1/p2p1n2/3Pp3/1P2P2p/2N1B2P/P2NQPP1/R4RK1 w kq - acd 23; acs 9; bm Nc4; c3 "Rac1"; ce 113; pm Nc4; pv Nc4 Rc8 Rfc1 g6 Rab1 O-O b5 Nc5 bxa6 bxa6 a4 Nh5 Rb6 Nf4 Qf1 Re8 a5 Bf8 Rc2 Ncd3 Bxf4 Nxf4 Rc6 Rxc6 dxc6 Bg7 Nd5 Nxd5 exd5;
r2qk2r/1p1nbpp1/p2p1n2/3Pp3/1P2P2p/2N1B2P/P2NQPP1/2R2RK1 b kq - acd 23; acs 5; bm Nh5; c3 "Rc8"; ce -98; pm Nh5; pv Nh5 Qf3 g6 Nc4 Rc8 Na5 Rc7 Ne2 O-O a4 Kg7 Rxc7 Qxc7 Rc1 Qb8 Bd2 f5 exf5 Rxf5 Qe4 Kh7 Qc4 Nb6 Qc7;
2rqk2r/1p1nbpp1/p2p1n2/3Pp3/1P2P2p/2N1B2P/P2NQPP1/2R2RK1 w k - acd 30; acs 47; bm Qd3; c3 "a4"; ce 111; pm Qd3; pv Qd3 g6 Ne2 O-O Nc4 Rc7 Rc3 Ne8 Bh6 Ng7 Rfc1 Kh7 Qd2 Rc8 Na5 Rxc3 Nxc3 Qb8 b5 axb5 Nxb5 Nc5 f3 f5 Be3 fxe4 Bxc5 dxc5 d6 Bd8 fxe4 Bxa5 Qxa5;
2rqk2r/1p1nbpp1/p2p1n2/3Pp3/PP2P2p/2N1B2P/3NQPP1/2R2RK1 b k - acd 30; acs 77; bm Nh5; c3 "Nh5"; ce -85; pm Nh5; pv Nh5 Na2 Rb8 Qg4 g6 Rc2 Rc8 Rxc8 Qxc8 Rc1 Qd8 Nc4 O-O Bh6 Ng7 Na5 Nf6 Qe2 Qd7 Nc3 Rc8 b5 axb5 Nxb5 Rxc1+ Bxc1 Ngh5 Qf3 Qc8 Ba3 Qc2 Bxd6 Bxd6 Nxd6 Qxa4 Naxb7 Qb4;
2rqk2r/1p1nbpp1/p2p4/3Pp2n/PP2P2p/2N1B2P/3NQPP1/2R2RK1 w k - acd 30; acs 43; bm Na2; c3 "a5"; ce 89; pm Na2; pv Na2 Rb8 Qg4 g6 Rc2 O-O Rfc1 Nf4 Qf3 Bg5 Rc7 a5 bxa5 f5 a6 bxa6 R7c6 Rb2 Rxd6 Rf6 Rdc6 Rxc6 dxc6 Nf6 c7 Qc8 Nc3 Qxc7 exf5 gxf5 Qa8+ Kf7 Qxa6 Kg6 Bxf4 Bxf4;
2rqk2r/1p1nbpp1/p2p4/P2Pp2n/1P2P2p/2N1B2P/3NQPP1/2R2RK1 b k - acd 30; acs 24; bm Nf4; c3 "Bg5"; ce -87; pm Nf4; pv Nf4 Bxf4 exf4 Na4 O-O Nc4 Bf6 Nab6 Rc7 Qd2 f3 gxf3 Bg5 f4 Bh6 Nxd7 Qxd7 Qe3 Qd8 Qf3 Qf6 Ne3 Rxc1 Rxc1 Qxf4 Qxf4 Bxf4 Rc7 Re8 Rxb7 Rxe4 Kg2 Bxe3 Kf3 Rd4 Kxe3 Rxd5;
2rqk2r/1p1n1pp1/p2p4/P2Pp1bn/1P2P2p/2N1B2P/3NQPP1/2R2RK1 w k - acd 30; acs 37; bm Nb5; c3 "Na4"; ce 286; pm Nb5; pv Nb5 Be7 Na7 Rb8 Rc3 Nf4 Bxf4 exf4 Rfc1 O-O Rc8 Rxc8 Rxc8 Qxc8 Nxc8 Rxc8 b5 axb5 Qxb5 Nc5 Nb3 Bf6 Nxc5 Rxc5 Qb6 Be5 Qd8+ Kh7 Qxh4+ Kg8 Qd8+ Kh7 f3 f6 Kh2 f5 exf5 Rxd5 Qh4+ Kg8 Qe7 Rc5 Qxb7 Rxa5 Qe7 Ra3 Qc7;
2rqk2r/1p1n1pp1/p2p4/P2Pp1bn/NP2P2p/4B2P/3NQPP1/2R2RK1 b k - acd 30; acs 17; bm Bxe3; c3 "Nf4"; ce -60; pm Bxe3; pv Bxe3 Qxe3 O-O Kh2 Nf4 Nf3 Qe7 g3 hxg3+ fxg3 Nh5 Nd2 Rxc1 Rxc1 Rb8 Nb2 Qd8 Nbc4 Rc8 Rg1 Qe7 Rf1 Nhf6 Qf3 Nf8 Kg2 N8d7 Qe3 Nf8 Rc1 N8d7 Rc3 Rc7 Qe2 g6 Qf3;
2rqk2r/1p1n1pp1/p2p4/P2Pp1b1/NP2Pn1p/4B2P/3NQPP1/2R2RK1 w k - acd 30; acs 44; bm Qg4; c3 "Bxf4"; ce 169; pm Qg4; pv Qg4 Bh6 Nb6 Rxc1 Rxc1 Nf6 Qd1 O-O Rc4 Kh7 Nf3 Ng6 Qc1 Bxe3 Qxe3 Nf4 Nxh4 g6 Nf3 Kg7 Rc8 Qe7 Rxf8 Qxf8 Ng5 Qh8 Nc4 Qh6 Nf3 Ne8 Nfd2 Qh4 Qf3 Qh5 Qg4 f5;
2rqk2r/1p1n1pp1/p2p4/P2Pp1b1/NP2PB1p/7P/3NQPP1/2R2RK1 b k - acd 30; acs 10; bm Bxf4; c3 "Bxf4"; ce -52; pm Bxf4; pv Bxf4 Rxc8 Qxc8 Nc4 Qc7 Ra1 O-O Ra2 Rc8 Rc2 g6 Qd3 Bg5 Rc3 Qb8 Nab6 Rc7 Nxd7 Rxd7 Nb6 Rc7 Rxc7 Qxc7 Qc4 Qxc4 Nxc4 Be7 Kf1 Kg7 Ke2 f5 Kd3 Kf7 Kd2 Kf6 Ke3 Kg7 Kf3;
2rqk2r/1p1n1pp1/p2p4/P2Pp3/NP2Pb1p/7P/3NQPP1/2R2RK1 w k - acd 30; acs 2; bm Rxc8; c3 "Rfd1"; ce 60; pm Rxc8; pv Rxc8 Qxc8 Nc4 Qc7 Ra1 O-O Ra2 Rc8 Rc2 Bg5 Qd3 Be7 Rc3 Qd8 Nab6 Nxb6 Nxb6 Rxc3 Qxc3 g6 Kf1 Kg7 Ke2 Qe8 Qc8 Qb5+ Qc4 Qe8 Kd2 Qd8 Qc2 Bg5+ Kc3 Bf4 Nc4 Qd7 Kb3 f5 Nb6 Qf7 exf5 gxf5;
2rqk2r/1p1n1pp1/p2p4/P2Pp3/NP2Pb1p/7P/3NQPP1/2RR2K1 b k - acd 30; acs 56; bm O-O; c3 "Rh6"; ce -23; pm O-O; pv O-O Rxc8 Qxc8 Nf3 g6 Nxh4 Qc7 Qd3 Rc8 g3 Bh6 Ng2 Qc4 Nc5 Qxd3 Nxd3 Rc3 g4 f5 exf5 e4 Nde1 gxf5 gxf5 Nf6 Rd4 Rxh3 Rc4 Nxd5 Rxe4 Rh5 Re8+ Kg7 Rb8 Rxf5 Rxb7+ Rf7 Rb8 Bd2 b5 axb5 a6 Nb4 Rb6 d5 Rd6 Bxe1;
2rqk3/1p1n1pp1/p2p3r/P2Pp3/NP2Pb1p/7P/3NQPP1/2RR2K1 w - - acd 30; acs 54; bm Rxc8; c3 "Rxc8"; ce 149; pm Rxc8; pv Rxc8 Qxc8 Nc4 Rg6 Nab2 Qd8 Ne3 Bxe3 Qxe3 Kf8 Rc1 Nf6 Na4 Kg8 Nb6 Qe7 Rc8+ Kh7 Qe2 Rg5 Qf3 g6 Rb8 Nh5 Kh2 Kg7 Qc3 Nf4 g3 hxg3+ fxg3 Qf6 Nd7 Nxd5 Nxf6 Nxc3 Ne8+ Kf8 h4 Rh5 Nf6+ Kg7 Nxh5+ gxh5 Rxb7 Nxe4 Ra7;
2Rqk3/1p1n1pp1/p2p3r/P2Pp3/NP2Pb1p/7P/3NQPP1/3R2K1 b - - acd 30; acs 19; bm Qxc8; c3 "Qxc8"; ce -146; pm Qxc8; pv Qxc8 Nc4 Ke7 Ra1 Rh8 Ra3 Rd8 Rc3 Qb8 Nab6 Nf6 Nb2 Bg5 Nd3 Kf8 Rc2 g6 Ne1 Bf4 Nf3 Nd7 Nc4 g5 Ne3 Bxe3 Qxe3 f6 Qc1 Kf7 Rc7 Kf8 Nd2 Kf7 Qc2 Kg7;
2q1k3/1p1n1pp1/p2p3r/P2Pp3/NP2Pb1p/7P/3NQPP1/3R2K1 w - - acd 30; acs 34; bm Nc4; c3 "Nf3"; ce 172; pm Nc4; pv Nc4 Kf8 Rb1 Nf6 b5 Rg6 Kh1 axb5 Nxd6 Qc7 Nxb5 Qxa5 Nc5 Ne8 Qc2 Kg8 Nd3 Qd8 Nxf4 exf4 Nd4 Rb6 Rxb6 Qxb6 Nf5 g6 Nxh4 Qc7 Qd2 b5 Nf3 f6 Kh2 Qd6 Nd4 b4 Nc6 b3 Qb2 f3+ Kg1 fxg2;
2q1k3/1p1n1pp1/p2p3r/P2Pp3/NP2Pb1p/5N1P/4QPP1/3R2K1 b - - acd 30; acs 84; bm Ke7; c3 "Qd8"; ce -81; pm Ke7; pv Ke7 Nb2 g5 Nd3 Kf8 Rb1 Rh8 b5 Kg7 bxa6 bxa6 Nh2 Nf6 Rb6 Qc3 Rxd6 Qxa5 Nf1 Qa4 Nc5 Qb5 Qxb5 axb5 Rb6 Ra8 g3 hxg3 fxg3 Bc1 Rb7 Rc8 Rxb5;
3qk3/1p1n1pp1/p2p3r/P2Pp3/NP2Pb1p/5N1P/4QPP1/3R2K1 w - - acd 30; acs 14; bm Rd3; c3 "Nb2"; ce 227; pm Rd3; pv Rd3 Rh8 Rc3 Ke7 Qc2 Kf6 Nb2 Bh6 Nxh4 g6 Nf3 Kg7 Na4 Nf6 Nb6 Ne8 g3 Qe7 Rc8 Rf8 Kg2 Kh7 Rc4 Kg7 Kg1 Kh7 h4 Kg7 Rc8 Kh7 g4 f5 exf5 gxf5 g5 Bg7 h5;
3qk3/1p1n1pp1/p2p3r/P2Pp3/1P2Pb1p/5N1P/1N2QPP1/3R2K1 b - - acd 30; acs 43; bm Qc7; c3 "Rg6"; ce -139; pm Qc7; pv Qc7 Nd3 g5 Nxf4 gxf4 Qb2 Nf6 Rc1 Qd7 Rc4 Kf8 Qc1 Ne8 Rc8 Kg7 Qc2 Rh5 Nd2 Rh8 Qc4 Rg8 Nf3 Kf8 Kh2 Rh8 Rb8 Ke7 Qc2 Rh5 Kg1 Rh8 Qc1 Rh5 Qc4 Rh6 Qc3 Kf8;
3qk3/1p1n1pp1/p2p2r1/P2Pp3/1P2Pb1p/5N1P/1N2QPP1/3R2K1 w - - acd 32; acs 89; bm Qc2; c3 "Nd3"; ce 345; pm Qc2; pv Qc2 Nf6 Nxh4 Rg5 Nc4 Kf8 g3 Rh5 Kg2 Rxh4 gxh4 Ne8 Rb1 Nc7 Qe2 Nb5 Qg4 Qc7 Nb6 Qc2 Qc8+ Qxc8 Nxc8 g6 Rb2 Bc1 Rc2 Ba3 Rc4 Kg7 Kg3 Kf6 Kg4 Bb2 Nb6 Bc3 h5 gxh5+ Kxh5 Bd4 f3 Be3 Rc2 Bxb6 axb6;
3qk3/1p1n1pp1/p2p2r1/P2Pp3/1P2Pb1p/3N1N1P/4QPP1/3R2K1 b - - acd 30; acs 221; bm Bg5; c3 "Kf8"; ce -329; pm Bg5; pv Bg5 Qc2 Qa8 Rb1 Be7 Nb2 Rh6 Nc4 Kf8 Ne3 g6 Rb3 Qe8 Qc7 Nf6 Qxb7 Nxe4 Qxa6 Qa4 Rb1 Qa2 Rf1 Kg7 Qb7 Bd8 a6 Bf6 Ng4 Rh8 Re1 Ng5 a7 Nxf3+ gxf3 Qa3;
3q1k2/1p1n1pp1/p2p2r1/P2Pp3/1P2Pb1p/3N1N1P/4QPP1/3R2K1 w - - acd 23; acs 7; bm Qc2; c3 "Nxf4"; ce 285; pm Qc2; pv Qc2 Bg5 Rb1 Nf6 b5 Qxa5 bxa6 Qxa6 Qc8+ Ne8 Nde1 Qa5 Nxg5 Rxg5 Nf3 Rh5 Rxb7 Qc5 Qd8 Qc1+ Kh2 Qf4+ Kh1 Qf6 Qd7 g5 Qc8 Rh6 Rb8 Qe7;
3q1k2/1p1n1pp1/p2p2r1/P2Pp3/1P2PN1p/5N1P/4QPP1/3R2K1 b - - acd 23; acs 2; bm exf4; c3 "exf4"; ce -296; pm exf4; pv exf4 Rc1 Ne5 Nxe5 dxe5 Qh5 Rg5 Rc8 Rxh5 Rxd8+ Ke7 Rb8 f5 Rxb7+ Kd8 Ra7 fxe4 Rxa6 e3 fxe3 fxe3 Kf1 e4 Ra8+ Kd7 Ke2 Rxd5 a6 Kc6 Kxe3 Rb5 Rg8;
3q1k2/1p1n1pp1/p2p2r1/P2P4/1P2Pp1p/5N1P/4QPP1/3R2K1 w - - acd 30; acs 7; bm Rc1; c3 "Rc1"; ce 358; pm Rc1; pv Rc1 Rh6 Rc4 Nf6 Qd2 g6 Qxf4 Kg7 Nxh4 Nh5 Qg4 Rh8 Nf5+ Kh7 Ne3 Qe7 Qd1 Nf6 f3 Rd8 Qc1 Ne8 Ng4 Rd7 Rc8 Rd8 Rc2 Rd7 g3 Kg8 Rc8 Rd8 Rc4 Rd7 Qc3 f6;
3q1k2/1p1n1pp1/p2p2r1/P2P4/1P2Pp1p/5N1P/4QPP1/2R3K1 b - - acd 30; acs 52; bm Nf6; c3 "Qf6"; ce -370; pm Nf6; pv Nf6 Nxh4 Rg5 Nf3 Rg6 Qc4 Rh6 Nd4 Ne8 Nf5 Rg6 Qe2 Qd7 Qf3 Rg5 Qxf4 Rh5 Nh4 Kg8 Rc4 g6 Nf3 Qe7 Qc1 Kg7 Qe3 Qf6 Rc8 Rh8 Qg5 Rh5 Qc1 Rh8 Ng5 Rh5 Ne6+ fxe6 Rxe8;
5k2/1p1n1pp1/p2p1qr1/P2P4/1P2Pp1p/5N1P/4QPP1/2R3K1 w - - acd 35; acs 228; bm Rc8+; c3 "Rc7"; ce 32740; pm Rc8+; pv Rc8+ Ke7 Qc4 Nc5 bxc5 Kd7 cxd6 Qxd6 e5 Qc6 dxc6+ Kxc8 Nd4 bxc6 Qxf7 c5 Qxg6 cxd4 Qc6+ Kd8 Qb7 f3 e6 Ke8 Qd7+ Kf8 Qf7+;
5k2/1pRn1pp1/p2p1qr1/P2P4/1P2Pp1p/5N1P/4QPP1/6K1 b - - acd 30; acs 74; bm Ne5; c3 "Ne5"; ce -668; pm Ne5; pv Ne5 Rxb7 Nxf3+ Qxf3 Kg8 Ra7 Qa1+ Kh2 Qf1 b5 Qxb5 Ra8+ Kh7 Qh5+ Rh6 Qxf7 Qb2 Qg8+ Kg6 Rxa6 Qf6 f3 Kh5 Ra7 Rg6 Qh8+ Rh6 Qxg7 Qxg7 Rxg7 Rh8 a6 Ra8 a7 Kh6 Rd7 Kg5 Kg1 Kf6 Rxd6+ Ke7 Rh6 Kd7 Rxh4 Kd6 Rh7 Kc5;
5k2/1pR2pp1/p2p1qr1/P2Pn3/1P2Pp1p/5N1P/4QPP1/6K1 w - - acd 30; acs 29; bm Rxb7; c3 "Rxb7"; ce 680; pm Rxb7; pv Rxb7 Kg8 Ra7 Nxf3+ Qxf3 Qa1+ Kh2 Qf1 b5 Qxb5 Ra8+ Kh7 Qh5+ Rh6 Qxf7 Qb2 Qg8+ Kg6 Rxa6 Qf6 f3 Kh5 Ra7 Rg6 Qh8+ Rh6 Qxg7 Qxg7 Rxg7 Rh8 a6 Ra8 a7 Kh6 Rd7 Kh5 Kg1 Kg5 Kf2 Kf6 Rxd6+ Ke7 Rh6 Kd7 e5 Kc7 Rxh4;
5k2/1R3pp1/p2p1qr1/P2Pn3/1P2Pp1p/5N1P/4QPP1/6K1 b - - acd 23; acs 1; bm Nxf3+; c3 "Nxf3+"; ce -652; pm Nxf3+; pv Nxf3+ Qxf3 Qa1+ Kh2 Rg5 b5 axb5 Qxf4 Qe5 Rb8+ Ke7 Qxe5+ Rxe5 a6 Rxe4 a7 Ra4 a8=Q Rxa8 Rxa8 g5 Rb8 Kf6 Rxb5 Ke5 g3 f6 Kg2 Ke4 gxh4 gxh4 Rb4+ Kxd5 Rxh4 Ke5 Kf3 Ke6 Kg3 Kf7;
5k2/1R3pp1/p2p1qr1/P2P4/1P2Pp1p/5n1P/4QPP1/6K1 w - - acd 23; acs 3; bm Qxf3; c3 "Qxf3"; ce 676; pm Qxf3; pv Qxf3 Qd8 Qxf4 Rf6 Qxh4 Kg8 b5 axb5 a6 Qc8 Kh2 b4 Rxb4 Qc7 Rb7 Qc8 Rb6 Qa8 Rb4 Qa7 Rb7 Qa8 Rd7 Qc8 a7 Qa8 Rc7;
5k2/1R3pp1/p2p1qr1/P2P4/1P2Pp1p/5Q1P/5PP1/6K1 b - - acd 23; acs 3; bm Rg5; c3 "Qa1+"; ce -697; pm Rg5; pv Rg5 Rb8+ Ke7 b5 axb5 Kh2 Qa1 Qxf4 Qe5 Qxe5+ Rxe5 a6 Rxe4 a7 Ra4 a8=Q Rxa8 Rxa8 Kf6 Rb8 Ke5 Rxb5 Ke4 g3 hxg3+ Kxg3 Kf5 Rb7 f6 Rb5 Ke5 Kg4 Ke4 Rb7;
5k2/1R3pp1/p2p2r1/P2P4/1P2Pp1p/5Q1P/5PP1/q5K1 w - - acd 23; acs 2; bm Kh2; c3 "Kh2"; ce 691; pm Kh2; pv Kh2 Rh6 Rb8+ Ke7 Ra8 Qe5 Ra7+ Kd8 Rxa6 Rg6 Rc6 Ke7 a6 Rg3 fxg3 hxg3+ Kg1 Qd4+ Kf1 Qa1+ Ke2 Qa2+ Kd1 Qa1+ Kc2 Qa2+ Kd3 Qa3+ Kd2 Qxb4+ Kc2 f6 Qd3 f3 Rc7+ Kd8;
5k2/1R3pp1/p2p2r1/P2P4/1P2Pp1p/5Q1P/5PPK/q7 b - - acd 32; acs 107; bm Rg5; c3 "Qf1"; ce -1023; pm Rg5; pv Rg5 Qxf4 Qe5 Rxf7+ Ke8 b5 Qxf4+ Rxf4 Rh5 b6 Rh8 Rxh4 Rg8 Kg3 Ke7 f4 Re8 Kf3 Rc8 Kg4 Kf6 Rh5 Rd8 Rf5+ Ke7 Rg5 Rg8 Rg6 Rd8 Rxg7+ Kf6 Rh7 Rf8 Kf3 Rc8 Rc7 Rb8 Ra7 Rc8 Rd7 Rc3+ Kg4 Rc8;
5k2/1R3pp1/p2p2r1/P2P4/1P2Pp1p/5Q1P/5PPK/5q2 w - - acd 29; acs 65; bm e5; c3 "b5"; ce 32718; pm e5; pv e5 Qc4 Qh5 Rxg2+ Kxg2 Qxd5+ Qf3 Qe6 Rb8+ Ke7 Qb7+ Qd7 exd6+ Kxd6 Qxa6+ Ke7 Qe2+ Kf6 Rb6+ Kg5 Rb5+ f5 Qg4+ Kf6 Rb6+ Kf7 Qg6+ Kf8 Rb8+ Ke7 Qxg7+ Kd6 Rb6+ Qc6+ Rxc6+ Kxc6 a6 f3+ Kxf3 Kb5 a7 Kxb4 a8=Q Kb3 Qd4 Kc2 Qa2+ Kc1 Qdd2+;
5k2/1R3pp1/p2p2r1/PP1P4/4Pp1p/5Q1P/5PPK/5q2 b - - acd 23; acs 0; bm Rg3; c3 "Rg3"; ce 0; pm Rg3; pv Rg3 Rxf7+ Ke8 Rf8+ Ke7 Rf7+ Ke8;
5k2/1R3pp1/p2p4/PP1P4/4Pp1p/5QrP/5PPK/5q2 w - - acd 26; acs 0; bm Rxf7+; c3 "bxa6"; ce 0; pm Rxf7+; pv Rxf7+ Ke8 Rf8+ Ke7 Rf7+ Ke8;
5k2/1R3pp1/P2p4/P2P4/4Pp1p/5QrP/5PPK/5q2 b - - acd 33; acs 1; bm Rxf3; c3 "Rxf3"; ce 0; pm Rxf3; pv Rxf3 a7 Rxh3+ Kxh3 Qh1+ Kg4 Qxg2+ Kf5 Qh3+ Kxf4 g5+ Kxg5 Qg2+ Kxh4 Qxe4+ Kg3 Qe5+ Kg4 Qd4+ Kh3 Qh8+ Kg2 Qg7+ Kf3 Qf6+ Kg4 Qd4+;
5k2/1R3pp1/P2p4/P2P4/4Pp1p/5r1P/5PPK/5q2 w - - acd 26; acs 0; bm a7; c3 "a7"; ce 0; pm a7; pv a7 Qa6 Rb8+ Ke7 a8=Q Qxa8 Rxa8 Rxf2 Kg1 Re2 Ra7+ Kf6 Rd7 Rxe4 Rxd6+ Ke7 Rc6 Rd4 Rc7+ Kf6 Rc6+ Ke5 Rc7 Rxd5 Rxf7 Rxa5 Rxg7 Kf6 Rh7 Ra1+ Kf2 Kg5 Kf3 Ra3+ Kf2 Ra2+ Kf3 Ra3+;
5k2/PR3pp1/3p4/P2P4/4Pp1p/5r1P/5PPK/5q2 b - - acd 26; acs 0; bm Kg8; c3 "g6"; ce 0; pm Kg8; pv Kg8 a8=Q+ Kh7 Qc8 Qxf2 Qg4 Qg3+ Kg1 Qe1+ Kh2 Qg3+;
5k2/PR3p2/3p2p1/P2P4/4Pp1p/5r1P/5PPK/5q2 w - - acd 23; acs 0; bm a8=Q+; c3 "a8=Q+"; ce 32750; pm a8=Q+; pv a8=Q+ Kg7 Qa7 Kg8 Qd4 Rb3 Rxb3 Kh7 Rb8 Kh6 Qf6 Qxg2+ Kxg2 f3+ Kxf3 Kh5 Rh8+;
Q4k2/1R3p2/3p2p1/P2P4/4Pp1p/5r1P/5PPK/5q2 b - - acd 23; acs 0; bm Kg7; c3 "Kg7"; ce -32751; pm Kg7; pv Kg7 Qa7 Kg8 Qd4 Rb3 Rxb3 Kh7 Rb8 Kh6 Qf6 Qxg2+ Kxg2 f3+ Kxf3 Kh5 Rh8+;
Q7/1R3pk1/3p2p1/P2P4/4Pp1p/5r1P/5PPK/5q2 w - - acd 23; acs 0; bm Qa7; c3 "Qe8"; ce 32752; pm Qa7; pv Qa7 Kg8 Qd4 Rb3 Rxb3 Kh7 Rb8 Kh6 Qf6 Qxg2+ Kxg2 f3+ Kxf3 Kh5 Rh8+;
4Q3/1R3pk1/3p2p1/P2P4/4Pp1p/5r1P/5PPK/5q2 b - - acd 23; acs 0; bm Rxh3+; c3 "Rxh3+"; ce 0; pm Rxh3+; pv Rxh3+ gxh3 Qxf2+ Kh1 Qf1+ Kh2 Qf2+;
4Q3/1R3pk1/3p2p1/P2P4/4Pp1p/7r/5PPK/5q2 w - - acd 23; acs 0; bm gxh3; c3 "Kxh3"; ce 0; pm gxh3; pv gxh3 Qxf2+ Kh1 Qf1+ Kh2 Qf2+;
4Q3/1R3pk1/3p2p1/P2P4/4Pp1p/7K/5PP1/5q2 b - - acd 17; acs 0; bm Qh1+; c3 "Qh1+"; ce 32760; pm Qh1+; pv Qh1+ Kg4 Qxg2+ Kxf4 Qxf2+ Kg4 Qg3+;
4Q3/1R3pk1/3p2p1/P2P4/4Pp1p/7K/5PP1/7q w - - acd 17; acs 0; bm Kg4; c3 "Kg4"; ce -32761; pm Kg4; pv Kg4 Qxg2+ Kxf4 Qxf2+ Kg4 Qg3+;
4Q3/1R3pk1/3p2p1/P2P4/4PpKp/8/5PP1/7q b - - acd 17; acs 0; bm Qxg2+; c3 "Qxg2+"; ce 32762; pm Qxg2+; pv Qxg2+ Kxf4 Qxf2+ Kg4 Qg3+;
4Q3/1R3pk1/3p2p1/P2P4/4PpKp/8/5Pq1/8 w - - acd 17; acs 0; bm Kxh4; c3 "Kxh4"; ce -32763; pm Kxh4; pv Kxh4 Qxf2+ Kh3 Qg3+;
4Q3/1R3pk1/3p2p1/P2P4/4Pp1K/8/5Pq1/8 b - - acd 17; acs 0; bm Qxf2+; c3 "Qxf2+"; ce 32764; pm Qxf2+; pv Qxf2+ Kg4 Qg3+;
4Q3/1R3pk1/3p2p1/P2P4/4Pp1K/8/5q2/8 w - - acd 17; acs 0; bm Kh3; c3 "Kg5"; ce -32765; pm Kh3; pv Kh3 Qg3+;
4Q3/1R3pk1/3p2p1/P2P2K1/4Pp2/8/5q2/8 b - - acd 17; acs 0; bm Qg3+; c3 "Qg3#"; ce 32766; pm Qg3+; pv Qg3+;

[Look]

up to here, where white blunders:
[d]Q7/1R3pk1/3p2p1/P2P4/4Pp1p/5r1P/5PPK/5q2 w - - acd 23; acs 0; bm Qa7; c3 "Qe8"; ce 32752; pm Qa7; pv Qa7 Kg8 Qd4 Rb3 Rxb3 Kh7 Rb8 Kh6 Qf6 Qxg2+ Kxg2 f3+ Kxf3 Kh5 Rh8+;

In this position, for instance both Qa7 and Qe8 threaten to capture on f7, the difference is that Qa7 defends f2 pawn too. So that going for perpetual check with ... Rxh3 is not possible.

[MikeB]

up to here, where white blunders:
[d]Q7/1R3pk1/3p2p1/P2P4/4Pp1p/5r1P/5PPK/5q2 w - - acd 23; acs 0; bm Qa7; c3 "Qe8"; ce 32752; pm Qa7; pv Qa7 Kg8 Qd4 Rb3 Rxb3 Kh7 Rb8 Kh6 Qf6 Qxg2+ Kxg2 f3+ Kxf3 Kh5 Rh8+;

In this position, for instance both Qa7 and Qe8 threaten to capture on f7, the difference is that Qa7 defends f2 pawn too. So that going for perpetual check with ... Rxh3 is not possible.

It's even simpler then that - it's a mate-in-8 with Qa7:

Code: Select all

 24	    #8 	3.50M  	0:00.12	Qa7 Kg8 Qd4 Rb3 Rxb3 Kh7 Rb8 Kh6 Qf6 Qxg2+ Kxg2 f3+ Kxf3 Kh5 Rh8# 
 23	    #8 	2.97M  	0:00.10	Qa7 Kg8 Qd4 Rb3 Rxb3 Kh7 Rb8 Kh6 Qf6 Qxg2+ Kxg2 f3+ Kxf3 Kh5 Rh8# 
 22	    #8 	2.58M  	0:00.09	Qa7 Kg8 Qd4 Rb3 Rxb3 Kh7 Rb8 Kh6 Qf6 Qxg2+ Kxg2 f3+ Kxf3 Kh5 Rh8# 
 21	    #8 	2.50M  	0:00.08	Qa7 Kg8 Qd4 Rb3 Rxb3 Kh7 Rb8 Kh6 Qf6 Qxg2+ Kxg2 f3+ Kxf3 Kh5 Rh8# 
 20	    #8 	2.42M  	0:00.08	Qa7 Kg8 Qd4 Rb3 Rxb3 Kh7 Rb8 Kh6 Qf6 Qxg2+ Kxg2 f3+ Kxf3 Kh5 Rh8# 
 19	    #8 	1.97M  	0:00.06	Qa7 Kg8 Qd4 Rb3 Rxb3 Kh7 Rb8 Kh6 Qf6 Qxg2+ Kxg2 f3+ Kxf3 Kh5 Rh8# 
 18	  #11 	1.48M  	0:00.05	Qa7 Kg8 Rxf7 Rxh3+ gxh3 Qxf2+ Qxf2 Kxf7 a6 g5 a7 g4 Qxf4+ Kg6 Qxg4+ Kf7 a8=Q Kf6 Qf8+ Ke5 Qfg7# 
 17	  #11 	1.25M  	0:00.04	Qa7 Kg8 Rxf7 Rxh3+ gxh3 Qxf2+ Qxf2 Kxf7 a6 Kf6 Qd4+ Kf7 a7 g5 a8=Q g4 Qaa7+ Kg6 hxg4 f3 Qdg7# 
 16	  #11 	1.16M  	0:00.04	Qa7 Kg8 Rxf7 Rxh3+ gxh3 Qxf2+ Qxf2 Kxf7 a6 Kf6 Qd4+ Kf7 a7 g5 a8=Q f3 Qaa7+ Kg6 Qdg7+ Kh5 Qh7# 
 15	  #11 	1.13M  	0:00.04	Qa7 Kg8 Rxf7 Rxh3+ gxh3 Qxf2+ Qxf2 Kxf7 a6 Kf6 Qd4+ Kf7 a7 g5 a8=Q f3 Qaa7+ Kg6 Qdg7+ Kh5 Qh7# 
 14	  #12 	1.05M  	0:00.04	Qa7 Kg8 Rxf7 Rxh3+ gxh3 Qxf2+ Qxf2 Kxf7 Qxf4+ Ke7 a6 g5 Qxg5+ Kf8 a7 Kf7 Qxh4 Kg6 a8=Q Kf7 Qa7+ Kg6 Qah7# 
 13	  #12 	1.01M  	0:00.03	Qa7 Kg8 Rxf7 Rxh3+ gxh3 Qxf2+ Qxf2 Kxf7 Qxf4+ Ke7 a6 g5 Qxg5+ Kf8 a7 Kf7 Qxh4 Kg6 a8=Q Kf7 Qa7+ Kg6 Qah7# 
 12	  #12 	992559	0:00.03	Qa7 Kg8 Rxf7 Rxh3+ gxh3 Qxf2+ Qxf2 Kxf7 Qxf4+ Ke7 a6 g5 Qxg5+ Kf8 a7 Kf7 Qxh4 
 11	  #14 	971309	0:00.03	Qa7 Kh6 Rxf7 Rxh3+ gxh3 Qxf2+ Qxf2 g5 Rf6+ Kg7 Rxd6 Kf7 Qd4 
 10	+11.37 	380700	0:00.02	Qa7 Kh6 gxf3 Qa1 Rxf7 Qb2 Rh7+ Kg5 Qe7+ Qf6 Qxf6+ Kxf6 a6 g5 a7 Kg6 
  9	+8.02 	192953	0:00.01	Qa7 Kh6 gxf3 Qe2 a6 Qd1 Rxf7 Qa1 Rxf4 Qe5 
  8	+3.47 	85213  	0:00.00	Rxf7+ Kxf7 Qa7+ Kg8 gxf3 Qe2 a6 Qxf3 Qd4 Qa3 a7 g5 
  7	+3.46 	81221  	0:00.00	Rxf7+ Kxf7 Qa7+ Kg8 gxf3 Qe2 Qb8+ Kh7 Kg2 Qa6 
  6	+2.60 	10028  	0:00.00	Rxf7+ Kxf7 Qa7+ Kf6 gxf3 Qe2 a6 Qb2 Kg2 
  5	+2.50 	7394    	0:00.00	Rxf7+ Kxf7 Qa7+ Kf6 gxf3 Qe2 a6 Qc4 
  4	+2.34 	4950    	0:00.00	Rxf7+ Kxf7 Qa7+ Kf6 gxf3 Qc4 a6 
  3	+2.17 	3610    	0:00.00	Rxf7+ Kxf7 Qa7+ Kf6 gxf3 
  2	+2.17 	2586    	0:00.00	Rxf7+ Kxf7 Qa7+ Kf6 
  1	+2.82 	950      	0:00.00	gxf3 Qxf2+ Kh1 Qxf3+ Kg1 
  0	# 

[gbtami]

I really hate to tell this, but this post has nothing to do with "chess playing software and machines". May I ask the moderators to move posts like this to "Chess Players Forum" please? Thx!

[Vinvin]

i kibitzed the following game online:
https://lichess.org/EBuhShf9

Several interesting positions happened in the game. You may post your analysis of them here.

I added the automatic analyze on Lichess (for what it's worth) : https://lichess.org/EBuhShf9#65