Two small EPD test sets that need a good pounding

[Dann Corbit]

Human expert advice also appreciated.
Steven J. Edwards has this subset of WCSAC to verify:

Code: Select all

8/1bp4p/p2p4/1p3rbk/4p3/1BP5/PP3PP1/3RR1K1 w - - acd 17; acn 7735890261; bm g4+; fmvn 1; hmvc 0; id WCSAC.0025; pes +1.131; pv a4 Re5 g3 Kg6 Bc2 Kg7 axb5 Rxb5 b4 Bf6 Re3 Re5 Rde1 a5 Bxe4 Rxe4 Rxe4 Bxe4 Rxe4 Bxc3; scv 09:06:07.94; solve 0; sts TimeLimitNode; suv 09:06:07.94; tbpc 0; 
2b5/1p3r2/p1p2rk1/P1Pp1pp1/3P2P1/4P2P/2B1K3/1R3R2 w - - acd 19; acn 9535805492; bm gxf5+; fmvn 1; hmvc 0; id WCSAC.0027; pes +0.838; pv Kd2 Be6 Rf2 Bc8 Rbf1 Rf8 Rg2 Rh8 Rb1 Rh7 Bd3 Rxh3 Bxf5+ Bxf5 gxf5+; scv 09:06:07.89; solve 0; sts TimeLimitNode; suv 09:06:07.89; tbpc 0; 
4rrk1/ppp1qppp/5n2/2b1n1N1/2B3b1/1QN5/PB4PP/4RR1K w - - acd 17; acn 6287162579; bm Bxf7+; fmvn 1; hmvc 0; id WCSAC.0037; pes +2.607; pv Nd5 Nxd5 Rxe5 Qxe5 Bxe5 Rxe5 Nxf7 Re3 Qxb7 Nf6 Ng5+ Kh8 Qxc7 Bb4 Qf4 Re1 Nf7+ Rxf7 Bxf7 Rxf1+ Qxf1 Bd6; scv 09:06:07.91; solve 0; sts TimeLimitNode; suv 09:06:07.91; tbpc 0; 
r1bq1rk1/pp2bp1p/2p2np1/3p2B1/3P4/2NQ2N1/PPP2PPP/4RRK1 w - - acd 16; acn 6287781389; bm Rxe7; fmvn 1; hmvc 0; id WCSAC.0062; pes +0.664; pv f4 Bd6 f5 Kg7 Nce2 h6 Bxf6+ Qxf6 fxg6 Qxg6 Qb3 a5 Nf4 Bxf4 Rxf4 a4 Qc3 Bg4; scv 09:06:07.94; solve 0; sts TimeLimitNode; suv 09:06:07.94; tbpc 0; 
2r1r1k1/1p1qbp1p/3p1p2/p2P4/3Q4/5N2/PP2RPPP/4R1K1 w - - acd 17; acn 6948581674; bm Rxe7; fmvn 1; hmvc 0; id WCSAC.0247; pes +1.500; pv h3 Bf8 Qxf6 Rxe2 Qg5+ Bg7 Rxe2 Re8 Rxe8+ Qxe8 b3 Qc8 Nh4 h6 Qd2 b6 Qe3 b5 Nf3 Qa8; scv 09:06:08.59; solve 0; sts TimeLimitNode; suv 09:06:07.91; tbpc 0; 
r2r2k1/ppb1qpp1/2n2n1p/2P1p3/1P1p4/P3PN2/1BQ1NPPP/3RK2R b K - acd 16; acn 6469927049; bm d3; fmvn 1; hmvc 0; id WCSAC.0253; pes +0.846; pv dxe3 Rxd8+ Rxd8 fxe3 Nd5 Qb3 b6 e4 Nf6 Qa4 Qd7 Nc3 bxc5 bxc5 Qd3 Kf2 Rb8 Ba1 Na5; scv 09:06:08.33; solve 0; sts TimeLimitNode; suv 09:06:07.86; tbpc 0; 
rn1q1rk1/pbppbppp/1p2p3/8/2P5/2n2NP1/PPQPPPBP/R1B1R1K1 w - - acd 17; acn 5791510767; bm Ng5; fmvn 1; hmvc 0; id WCSAC.0315; pes +0.033; pv dxc3 f5 Bf4 Na6 b4 Bf6 Qd2 Qe8 c5 Rc8 cxb6 cxb6 Rac1 e5 Bg5 e4 Nd4 Bxg5 Qxg5; scv 09:06:08.35; solve 0; sts TimeLimitNode; suv 09:06:07.87; tbpc 0; 
rqb2rk1/1p2pp1p/p5p1/3Nb3/P1B2n2/1Q3N2/1P3PPP/2RR2K1 w - - acd 15; acn 6539342980; bm Nb6; fmvn 1; hmvc 0; id WCSAC.0327; pes +1.635; pv Nxe7+ Kh8 Nxc8 Rxc8 g3 Bf6 gxf4 Qxf4 Rc2 Rab8 h3 b5 axb5 axb5 Bd5 Rxc2 Qxc2 Rg8; scv 09:06:08.32; solve 0; sts TimeLimitNode; suv 09:06:07.86; tbpc 0; 
3r4/1p3k1p/p1b1p1p1/4Q1Pn/2B3KP/4pP2/PP2R1N1/6q1 b - - acd 16; acn 7364112938; bm Rd4+; fmvn 1; hmvc 0; id WCSAC.0472; pes +1.243; pv Bd7 Kh3 Qh1+ Kg4 b5 Bb3 Ke7 Nxe3 Qg1+ Kh3 Rf8 Nd5+ Ke8 Nf6+ Rxf6 Qb8+ Kf7 gxf6 Qf1+ Rg2 Qh1+ Qh2 Nf4+ Kg3 Qxg2+ Qxg2 Nxg2 Kxg2 Kxf6; scv 09:06:08.35; solve 0; sts TimeLimitNode; suv 09:06:07.89; tbpc 0; 
r4rk1/2p2pp1/pppb1q1p/4pN2/3PPn2/5Q1P/PPP2PP1/R1B2RK1 b - - acd 17; acn 6555834146; bm exd4; fmvn 1; hmvc 0; id WCSAC.0475; pes -1.381; pv g5 Bxf4 gxf4 Qh5 Qg6 Qxh6 exd4 Qxg6+ fxg6 Nxd4 Rae8 Rfe1 Be5 c3 Bxd4 cxd4 Re6 e5 Rfe8 g3 f3 Rac1; scv 09:06:08.53; solve 0; sts TimeLimitNode; suv 09:06:07.92; tbpc 0; 
2rr1b2/8/ppkq1pP1/3pp3/2p5/2BPPpP1/BQ3P2/1RRN1n1K b - - acd 15; acn 6613870754; bm Qb8; fmvn 1; hmvc 0; id WCSAC.0580; pes -2.265; pv Rb8 dxc4 d4 Qc2 dxc3 Nxc3 Qd3 Nd5 Qxc2 Rxc2 Nxg3+ fxg3 Bg7 Kg1 Rh8 Rcb2 b5 cxb5+ axb5; scv 09:06:08.39; solve 0; sts TimeLimitNode; suv 09:06:07.89; tbpc 0; 
5k2/p1q2p1p/2Pr2p1/4Q3/P7/6P1/5P1P/2R3K1 w - - acd 15; acn 9138289340; bm Qxd6+; fmvn 1; hmvc 0; id WCSAC.0641; pes +6.560; pv Re1 Kg8 Qe8+ Kg7 Re7 Qxe7 Qxe7 Rxc6 Qxa7 Rc4 a5 h5 h4; scv 09:06:07.89; solve 0; sts TimeLimitNode; suv 09:06:07.89; tbpc 0; 
rnb1kb1r/pp3p2/2p4p/7q/3PN2P/1B4p1/PPP2KP1/R1BQN2R w kq - acd 18; acn 6837252835; bm Ke3; fmvn 1; hmvc 0; id WCSAC.0824; pes +1.274; pv Kf1 Qxd1 c3 Qxb3 axb3 Be6 Bf4 Be7 Nxg3 Na6 b4 O-O-O; scv 09:06:07.88; solve 0; sts TimeLimitNode; suv 09:06:07.88; tbpc 0; 
rnb3kr/1p1nqppp/p3p3/2ppP3/3P1N2/2NB1Q2/PPP2PP1/R3K2R w KQ - acd 15; acn 6849556469; bm Bxh7+; fmvn 1; hmvc 0; id WCSAC.0875; pes -0.254; pv Nfxd5 exd5 Nxd5 Qd8 Rxh7 Rxh7 Bxh7+ Kxh7 Qxf7 Nc6 e6; scv 09:06:07.86; solve 0; sts TimeLimitNode; suv 09:06:07.86; tbpc 0; 
3q4/p2nbk1p/2R1p1pB/1p1rPp2/8/5N1P/PPQ2PP1/7K w - - acd 16; acn 7176340340; bm Rxe6; fmvn 1; hmvc 0; id WCSAC.0876; pes +1.306; pv Rc8 Qb6 Rh8 Qc5 Qxc5 Rxc5 Rxh7+ Ke8 Rh8+ Kf7 Ra8 Rc7 Be3 Nb6 Rb8 Nc4 Rxb5 Nxe3 fxe3; scv 09:06:08.84; solve 0; sts TimeLimitNode; suv 09:06:07.85; tbpc 0; 
2rnr1k1/ppq2p1p/5Qp1/2N5/4b3/2P1B1b1/PP2B1P1/3R1R1K w - - acd 16; acn 6653050555; bm Bh6; fmvn 1; hmvc 0; id WCSAC.0915; pes +2.298; pv Bg4 Bxg2+ Kxg2 Be5 Qh4 Ra8 Rd7 Qb6 Qf2 Qb5 a4 Qc4 Be2 Qa2 Nxb7 Nxb7; scv 09:06:07.89; solve 0; sts TimeLimitNode; suv 09:06:07.89; tbpc 0; 
8/3R2pp/5k2/5P2/5BP1/7K/4q2P/8 b - - acd 17; acn 9737730824; bm Qf3+; fmvn 1; hmvc 0; id WCSAC.0991; pes +0.841; pv h5 Rd6+ Kf7 gxh5 Qf3+ Bg3 Qxh5+ Kg2 Qxf5 Kg1 Kg8 Rc6 Qb1+ Kf2 Qa2+ Ke3 Qb3+ Kf2 Qb2+ Ke3 Qa3+ Kd2 Kf7 Rc7+ Kg6 Ke2; scv 09:06:58.93; solve 0; sts TimeLimitNode; suv 09:06:07.93; tbpc 448462; 

And these are from "Test des logiciels en finale":

Code: Select all

1n6/5pp1/2K5/7p/N7/P3k2P/6P1/8 w - - bm Kb7; id "Test des logiciels en finale.003";
2r1k3/3b1pp1/8/p3p1P1/1p2Pn2/4BP2/PPP5/1K1R1B2 w - - bm Bxf4; id "Test des logiciels en finale.010";
2r2k2/6p1/1p2pp1p/p1P1R2P/2K5/1P6/P4PP1/8 w - - bm Kb5; id "Test des logiciels en finale.011";
2r5/8/1p1Pk3/p3p1p1/PP4P1/3R2K1/8/8 b - - bm e4; id "Test des logiciels en finale.012";
3Q4/5pk1/4q1p1/4P2p/7P/4K1P1/5P2/8 w - - bm Qf6+; id "Test des logiciels en finale.013";
3R4/1kr2pp1/2p1p3/1pP1PnBP/pP3K2/8/P4P2/8 w - - bm Bf6; id "Test des logiciels en finale.014";
3r1k2/R4pp1/7p/8/8/7P/P3RPPK/3r4 b - - bm R1d2; id "Test des logiciels en finale.020";
4Q3/Pq4pk/5p1p/5P1K/6PP/8/8/8 w - - bm a8=B; id "Test des logiciels en finale.024";
5q2/n2P1k2/2b5/8/8/3N4/4BK2/6Q1 w - - bm Qg5; id "Test des logiciels en finale.032";
6K1/7B/5p1p/2Nn1N2/7B/b7/3k1Pp1/8 w - - bm Nd4; id "Test des logiciels en finale.034";
6k1/3p4/5Q2/1q3pKp/8/8/P7/8 w - - bm Kg6; id "Test des logiciels en finale.039";
6k1/5p1p/6p1/ppp5/4b3/P1P1P3/5PPP/3B2K1 b - - bm a4; id "Test des logiciels en finale.042";
6k1/5p2/6p1/1P1R3p/5P2/8/5KPP/1r6 w - - bm Ke3; id "Test des logiciels en finale.043";
6k1/8/8/1K4p1/3p2P1/2pp4/8/1R6 w - - bm Kc6; id "Test des logiciels en finale.049";
7b/8/kq6/8/8/1N2R3/K2P4/8 w - - bm Nd4; id "Test des logiciels en finale.052";
8/1B2kpp1/p3p2p/3n4/PPp5/7P/2PK1PP1/8 w - - bm Bxd5; id "Test des logiciels en finale.056";
8/1Pk2Kpp/8/8/4nPP1/7P/8/8 b - - bm Nf2; id "Test des logiciels en finale.058";
8/2K5/1p6/1P4k1/5p2/8/6P1/8 w - - bm Kc6; id "Test des logiciels en finale.066";
8/2R2p2/6p1/6Pp/7P/4k1P1/2p3K1/2r5 b - - bm Re1; id "Test des logiciels en finale.069";
8/2p2b2/Pp1p4/4pp2/k7/2P5/1P2BPK1/8 w - - bm b3+; id "Test des logiciels en finale.071";
8/4b3/4p3/1k1n1p1p/1pNPpP1P/pP2P2K/P2B4/8 b - - bm Nc3; id "Test des logiciels en finale.081";
8/5pp1/3k2p1/1p6/pPB5/P4Kb1/5PP1/8 w - - bm fxg3; id "Test des logiciels en finale.088";
8/8/4b1p1/2Bp3p/5P1P/1pK1Pk2/8/8 b - - bm g5; id "Test des logiciels en finale.097";
8/B1p2p1P/8/4p3/8/k7/p2K4/8 w - - bm Bd4; id "Test des logiciels en finale.104";
8/pR4pk/1b6/2p5/N1p5/8/PP1r2PP/6K1 b - - bm Rxb2; id "Test des logiciels en finale.114";
8/pp4p1/2np1k1p/3B3P/3P1K2/P1P3P1/6P1/8 w - - bm Bxc6; id "Test des logiciels en finale.116";
8/pp6/1p6/5N2/4N3/P7/5npn/K6k w - - bm Nfg3+; id "Test des logiciels en finale.117";
nK6/2p3pk/1pp5/1P3NP1/5P2/1P4P1/p1B5/8 w - - bm Ne3+; id "Test des logiciels en finale.119";

[Albert Silver]

Human expert advice also appreciated.
Steven J. Edwards has this subset of WCSAC to verify.

I took a look.

[d]8/1bp4p/p2p4/1p3rbk/4p3/1BP5/PP3PP1/3RR1K1 w - -

acn 7735890261; bm g4+; fmvn 1; hmvc 0; id WCSAC.0025; pes +1.131; pv a4 Re5 g3 Kg6 Bc2 Kg7 axb5 Rxb5 b4 Bf6 Re3 Re5 Rde1 a5 Bxe4 Rxe4 Rxe4 Bxe4 Rxe4 Bxc3; scv 09:06:07.94; solve 0; sts TimeLimitNode; suv 09:06:07.94; tbpc 0;

Np with 1.g4+, which must be best, though it will be tough work trying to win this.

[d]2b5/1p3r2/p1p2rk1/P1Pp1pp1/3P2P1/4P2P/2B1K3/1R3R2 w - - acd 19;

acn 9535805492; bm gxf5+; fmvn 1; hmvc 0; id WCSAC.0027; pes +0.838; pv Kd2 Be6 Rf2 Bc8 Rbf1 Rf8 Rg2 Rh8 Rb1 Rh7 Bd3 Rxh3 Bxf5+ Bxf5 gxf5+; scv 09:06:07.89; solve 0; sts TimeLimitNode; suv 09:06:07.89; tbpc 0;

1.gxf5 is a clear win of a pawn, more if black takes back.

[d]4rrk1/ppp1qppp/5n2/2b1n1N1/2B3b1/1QN5/PB4PP/4RR1K w - - acd 17;

acn 6287162579; bm Bxf7+; fmvn 1; hmvc 0; id WCSAC.0037; pes +2.607; pv Nd5 Nxd5 Rxe5 Qxe5 Bxe5 Rxe5 Nxf7 Re3 Qxb7 Nf6 Ng5+ Kh8 Qxc7 Bb4 Qf4 Re1 Nf7+ Rxf7 Bxf7 Rxf1+ Qxf1 Bd6; scv 09:06:07.91; solve 0; sts TimeLimitNode; suv 09:06:07.91; tbpc 0;

Don't agree with 1.Bxf7+ though. 1...Nxf7 2.Rxe7 Rxe7 and then what? The game's 1.Nxd5 looks clear best unless there is a clever line I missed.

[d]r1bq1rk1/pp2bp1p/2p2np1/3p2B1/3P4/2NQ2N1/PPP2PPP/4RRK1 w - - acd 16;

acn 6287781389; bm Rxe7; fmvn 1; hmvc 0; id WCSAC.0062; pes +0.664; pv f4 Bd6 f5 Kg7 Nce2 h6 Bxf6+ Qxf6 fxg6 Qxg6 Qb3 a5 Nf4 Bxf4 Rxf4 a4 Qc3 Bg4; scv 09:06:07.94; solve 0; sts TimeLimitNode; suv 09:06:07.94; tbpc 0;

1.Rxe7 is clear.

[d]2r1r1k1/1p1qbp1p/3p1p2/p2P4/3Q4/5N2/PP2RPPP/4R1K1 w - - acd 17;

acn 6948581674; bm Rxe7; fmvn 1; hmvc 0; id WCSAC.0247; pes +1.500; pv h3 Bf8 Qxf6 Rxe2 Qg5+ Bg7 Rxe2 Re8 Rxe8+ Qxe8 b3 Qc8 Nh4 h6 Qd2 b6 Qe3 b5 Nf3 Qa8; scv 09:06:08.59; solve 0; sts TimeLimitNode; suv 09:06:07.91; tbpc 0;

I don't understand the suggested move at all. 1.Rxe7 gives up the exchange for what? Granted after 1...Qxe7 2.h3 Qc7 3.Rxe8 Rxe8 4.Qxf6, black is fairly open, but unless there is a way to finalize, I don't see how this is an improvement over the game.

[d]r2r2k1/ppb1qpp1/2n2n1p/2P1p3/1P1p4/P3PN2/1BQ1NPPP/3RK2R b K - acd 16;

acn 6469927049; bm d3; fmvn 1; hmvc 0; id WCSAC.0253; pes +0.846; pv dxe3 Rxd8+ Rxd8 fxe3 Nd5 Qb3 b6 e4 Nf6 Qa4 Qd7 Nc3 bxc5 bxc5 Qd3 Kf2 Rb8 Ba1 Na5; scv 09:06:08.33; solve 0; sts TimeLimitNode; suv 09:06:07.86; tbpc 0;

1.d3! is convincing.

[d]rn1q1rk1/pbppbppp/1p2p3/8/2P5/2n2NP1/PPQPPPBP/R1B1R1K1 w - - acd 17;

acn 5791510767; bm Ng5; fmvn 1; hmvc 0; id WCSAC.0315; pes +0.033; pv dxc3 f5 Bf4 Na6 b4 Bf6 Qd2 Qe8 c5 Rc8 cxb6 cxb6 Rac1 e5 Bg5 e4 Nd4 Bxg5 Qxg5; scv 09:06:08.35; solve 0; sts TimeLimitNode; suv 09:06:07.87; tbpc 0;

1.Ng5 looks fancy, but it only loses a pawn after 1...Nxe2+ 2.Rxe2 Bxg5 3.Bxb7 Nc6!, and if 4.Bxa8 Nd4! is good.

[d]rqb2rk1/1p2pp1p/p5p1/3Nb3/P1B2n2/1Q3N2/1P3PPP/2RR2K1 w - - acd 15;

acn 6539342980; bm Nb6; fmvn 1; hmvc 0; id WCSAC.0327; pes +1.635; pv Nxe7+ Kh8 Nxc8 Rxc8 g3 Bf6 gxf4 Qxf4 Rc2 Rab8 h3 b5 axb5 axb5 Bd5 Rxc2 Qxc2 Rg8; scv 09:06:08.32; solve 0; sts TimeLimitNode; suv 09:06:07.86; tbpc 0;

1.Nb6 is probably an improvement.

[d]3r4/1p3k1p/p1b1p1p1/4Q1Pn/2B3KP/4pP2/PP2R1N1/6q1 b - - acd 16;

acn 7364112938; bm Rd4+; fmvn 1; hmvc 0; id WCSAC.0472; pes +1.243; pv Bd7 Kh3 Qh1+ Kg4 b5 Bb3 Ke7 Nxe3 Qg1+ Kh3 Rf8 Nd5+ Ke8 Nf6+ Rxf6 Qb8+ Kf7 gxf6 Qf1+ Rg2 Qh1+ Qh2 Nf4+ Kg3 Qxg2+ Qxg2 Nxg2 Kxg2 Kxf6; scv 09:06:08.35; solve 0; sts TimeLimitNode; suv 09:06:07.89; tbpc 0;

1...Rd4+ 2.Qxd4 Qh2 is certainly spectacular, but I don't think black can escape the perpetual after 3.Bxe6 Ke7 4.Qb4+ Ke8 5.Bf7+ Kxf7 6.Qb3+ Ke7 7.Qxe3+ Kd8 8.Rd2+ Bd7 9.Rxd7+ etc.

[d]r4rk1/2p2pp1/pppb1q1p/4pN2/3PPn2/5Q1P/PPP2PP1/R1B2RK1 b - - acd 17;

acn 6555834146; bm exd4; fmvn 1; hmvc 0; id WCSAC.0475; pes -1.381; pv g5 Bxf4 gxf4 Qh5 Qg6 Qxh6 exd4 Qxg6+ fxg6 Nxd4 Rae8 Rfe1 Be5 c3 Bxd4 cxd4 Re6 e5 Rfe8 g3 f3 Rac1; scv 09:06:08.53; solve 0; sts TimeLimitNode; suv 09:06:07.92; tbpc 0;

1...exd4 looks like hara-kiri to me. What's the line after 2.Bxf4?

[d]2rr1b2/8/ppkq1pP1/3pp3/2p5/2BPPpP1/BQ3P2/1RRN1n1K b - - acd 15;

acn 6613870754; bm Qb8; fmvn 1; hmvc 0; id WCSAC.0580; pes -2.265; pv Rb8 dxc4 d4 Qc2 dxc3 Nxc3 Qd3 Nd5 Qxc2 Rxc2 Nxg3+ fxg3 Bg7 Kg1 Rh8 Rcb2 b5 cxb5+ axb5; scv 09:06:08.39; solve 0; sts TimeLimitNode; suv 09:06:07.89; tbpc 0;

Not that black necessarily has *any* save here, but 1...Qb8 doesn't seem to be it after 2.Kf1.

[d]5k2/p1q2p1p/2Pr2p1/4Q3/P7/6P1/5P1P/2R3K1 w - - acd 15;

acn 9138289340; bm Qxd6+; fmvn 1; hmvc 0; id WCSAC.0641; pes +6.560; pv Re1 Kg8 Qe8+ Kg7 Re7 Qxe7 Qxe7 Rxc6 Qxa7 Rc4 a5 h5 h4; scv 09:06:07.89; solve 0; sts TimeLimitNode; suv 09:06:07.89; tbpc 0;

No question about 1.Qxd6!

[d]rnb1kb1r/pp3p2/2p4p/7q/3PN2P/1B4p1/PPP2KP1/R1BQN2R w kq - acd 18;

acn 6837252835; bm Ke3; fmvn 1; hmvc 0; id WCSAC.0824; pes +1.274; pv Kf1 Qxd1 c3 Qxb3 axb3 Be6 Bf4 Be7 Nxg3 Na6 b4 O-O-O; scv 09:06:07.88; solve 0; sts TimeLimitNode; suv 09:06:07.88; tbpc 0;

1.Ke3 is better, but 1.Kf1 is good too.

[d]rnb3kr/1p1nqppp/p3p3/2ppP3/3P1N2/2NB1Q2/PPP2PP1/R3K2R w KQ - acd 15;

acn 6849556469; bm Bxh7+; fmvn 1; hmvc 0; id WCSAC.0875; pes -0.254; pv Nfxd5 exd5 Nxd5 Qd8 Rxh7 Rxh7 Bxh7+ Kxh7 Qxf7 Nc6 e6; scv 09:06:07.86; solve 0; sts TimeLimitNode; suv 09:06:07.86; tbpc 0;

I don't see how one concludes with this. That said, I think an improvement over the game can indeed be found after 1.Nfxd5 exd5 2.Nxd5 Qd8 3.Rxh7 Rxh7 4.Bxh7+ Kxh7

[d]rnbq4/1p1n1ppk/p7/2pNP3/3P4/5Q2/PPP2PP1/R3K3 w Q -

Instead of 5.Qxf7 as in the game, 5.Qh5+ Kg8 6.0-0-0 Nf8 7.Rh1 f5 (or f6) 8.exf6 gxf6

[d]rnbq1nk1/1p6/p4p2/2pN3Q/3P4/8/PPP2PP1/2K4R w - -

9.dxc5 (grabs another pawn and prevents Qd6 as after 9.c4) and a sample line could go 9...Nc6 (Nd7 to try and protect f6 gets mated)10.Qh8+ Kf7 11.Rh6 Ke6 12.Qg8+ Ke5 13.Nxf6 Qxf6 14.Rxf6 Kxf6 15.Qxf8+ Kg6

[d]r1b2Q2/1p6/p1n3k1/2P5/8/8/PPP2PP1/2K5 w - -

and with black's development problems, king in the open, and huge deficit in pawns, my money is on white.

[d]3q4/p2nbk1p/2R1p1pB/1p1rPp2/8/5N1P/PPQ2PP1/7K w - - acd 16;

acn 7176340340; bm Rxe6; fmvn 1; hmvc 0; id WCSAC.0876; pes +1.306; pv Rc8 Qb6 Rh8 Qc5 Qxc5 Rxc5 Rxh7+ Ke8 Rh8+ Kf7 Ra8 Rc7 Be3 Nb6 Rb8 Nc4 Rxb5 Nxe3 fxe3; scv 09:06:08.84; solve 0; sts TimeLimitNode; suv 09:06:07.85; tbpc 0;

1.Rxe6 fails to Nc5. However after 1.Rc8 Qb6 white can improve with the impressive 2.b4! Bxb4 3.Be3 Bc5 4.Bxc5 Nxc5

[d]2R5/p4k1p/1q2p1p1/1pnrPp2/8/5N1P/P1Q2PP1/7K w - -

5.Qc1! Ke7 6.Qh6 Rd8 7.Qxh7+ Ke8 8.Qxg6 Kd7 9.Rxd8+ Kxd8 10.Qg8+ Kd7 and with white's h-pawn black is doomed.

[d]2rnr1k1/ppq2p1p/5Qp1/2N5/4b3/2P1B1b1/PP2B1P1/3R1R1K w - - acd 16;

acn 6653050555; bm Bh6; fmvn 1; hmvc 0; id WCSAC.0915; pes +2.298; pv Bg4 Bxg2+ Kxg2 Be5 Qh4 Ra8 Rd7 Qb6 Qf2 Qb5 a4 Qc4 Be2 Qa2 Nxb7 Nxb7; scv 09:06:07.89; solve 0; sts TimeLimitNode; suv 09:06:07.89; tbpc 0;

1.Bh6 probably loses after 1...Bxg2+ 2.Kxg2 (2.Kg1 Be5) Rxe2+ 3.Kf3 Be5. The game looks best, except for 4.Rd7, which can probably be improved on with 4.Rh1 or even Bd7-a4-b3 and Rd7.

On the other hand, one cute win comes after 1.Bg4 Bc2 2.Bd4 Be5

[d]2rnr1k1/ppq2p1p/5Qp1/2N1b3/3B2B1/2P5/PPb3P1/3R1R1K w - -

White to play and win.


3.Rde1!! and if Bxf6 4.Rxe8+ Kg7 5.Bxf6+ Kh6 6.Rf3!

[d]8/3R2pp/5k2/5P2/5BP1/7K/4q2P/8 b - - acd 17;

acn 9737730824; bm Qf3+; fmvn 1; hmvc 0; id WCSAC.0991; pes +0.841; pv h5 Rd6+ Kf7 gxh5 Qf3+ Bg3 Qxh5+ Kg2 Qxf5 Kg1 Kg8 Rc6 Qb1+ Kf2 Qa2+ Ke3 Qb3+ Kf2 Qb2+ Ke3 Qa3+ Kd2 Kf7 Rc7+ Kg6 Ke2; scv 09:06:58.93; solve 0; sts TimeLimitNode; suv 09:06:07.93; tbpc 448462;

Nothing wrong with 1...Qf3+ but I think it's still a draw after 2.Bg3 g5 3.fxg6 Kg5 4.Rf7 Qxg4+ 5.Kg2 Qe4+ 6.Rf3 hxg6 (6...Kg4 7.h3+) and I don't think black has any way of penetrating the king.

Albert