Sting SF 9.8 update

[lech]

download: http://www.mediafire.com/file/dod3k84h1 ... -sf-98.zip

In my long-term work (project Sting) I selected the following groups of problems:

fortresses
zugzwangs
neutral checks
neutral pawn moves
neutral positions
passed pawns
mates
trapped pieces
pawn walls
sacrifices
chinese sacrifices
lazy kings
stalemates
opposite colored Bishops
maneuvering moves

For each of them I prepared a special code added to the classic alpha-beta engine: Stockfish 2.1.1.
All the problems and my solutions (Sting) you can check by the 80 following test ("IQ") positions.
[pgn][Result "1"]
[FEN "7k/6rp/6pN/1r4P1/3B4/8/8/K7 b - - "]

1... Rxg5 {win}

[Result "2"]
[FEN "1B1k4/3p4/1Kp5/PpP2p2/1PqP1P2/8/1P6/8 w - - "]

1. a6 {win}

[Result "3"]
[FEN "3N2r1/2K1p3/4Pk2/8/Bp5b/8/2P5/8 b - - "]

1... Bg3+ 2. Kd7 Rxd8+ {win}

[Result "4"]
[FEN "8/7p/5P1k/1p5P/5p2/2p1p3/P1P1P1P1/1K3Nb1 w - - "]

1. Ng3 {win}

[Result "5"]
[FEN "6q1/PpB5/k7/P6K/6n1/1P4p1/5p2/1B3N1N w - - "]

1. a8Q+ {or 1. a8R+ win}

[Result "6"]
[FEN "6k1/6p1/4Rb1p/p7/rp2P1N1/2P3P1/1P5P/6K1 b - - "]

1... Bxc3 {win}

[Result "7"]
[FEN "8/8/p2k1p2/1p1p3p/1P1P3p/P3NPP1/5K2/1b6 w - - "]

1. Ng2 {win}

[Result "8"]
[FEN "2k5/p7/Pp1p1b2/1P1P1p2/2P2P1p/3K3P/5B2/8 w - - "]

1. c5 {win}

[Result "9"]
[FEN "1n6/Pp1p1p1p/1P1P1P1P/4K3/2p5/p7/rpp1P3/qkb1R3 w - - "]

1. axb8N {win}

[Result "10"]
[FEN "1N4K1/1pp1p3/7k/2r3pP/p2pp1P1/P6N/8/2B5 w - - "]

1. Nc6 {draw - no gain}

[Result "11"]
[FEN "5K2/k4p1p/5p1p/1p3p2/bP6/1p6/1P5p/7B w - - "]

1. Ke8 {or 1. Ke7 win}

[Result "12"]
[FEN "k1b5/1p1p1p1p/1PpPpP2/2B5/8/2p1p2P/2PbP3/3K4 w - - "]

1. Bd4 {win}

[Result "13"]
[FEN "8/8/8/8/1kB1q3/8/1PRb4/1K6 b - - "]

1... Qh1+ 2. Ka2 Qa8+ 3.Kb1 Qe4 {or other way to get the start position for white - win}

[Result "14"]
[FEN "8/2N4r/1p3pkp/8/5K1p/2P4N/P3Bn2/8 w - - "]

1. Bh5+ {win}

[Result "15"]
[FEN "4k1rr/1R1R3p/8/8/8/2K5/7P/8 w k - "]

1. Rd2 {win}

[Result "16"]
[FEN "5k2/4bp2/2B3p1/1P4p1/3R4/3P2PP/2r2PK1/8 b - - "]

1. Rxf2+ {draw - no gain}

[Result "17"]
[FEN "1b6/2p5/1kB5/1PN5/8/3K4/8/q7 w - - "]

1. Nb3 {draw - no gain}

[Result "18"]
[FEN "N7/8/2KQ2rp/6k1/3p3p/2p4P/4PP2/5N2 w - - "]

1. f4+ {draw - no gain}

[Result "19"]
[FEN "2b1r3/r2ppN2/8/1p1p1k2/pP1P4/2P3R1/PP3PP1/2K5 w - - "]

1. Nd6+ {draw - no gain}

[Result "20"]
[FEN "8/8/4B3/6p1/7k/8/4pPKP/8 w - - "]

1. Bg4 {draw - no gain}

[Result "21"]
[FEN "r7/7k/5R2/p3p3/Pp1pPp2/1PpP1Pp1/K1P3P1/8 w - - "]

1. Kb1 Kg7 2. Rh6 {or 1... Rh8 2. Rf8 draw - no gain}

[Result "22"]
[FEN "1K3kB1/8/6p1/7R/8/4b3/8/6n1 w - - "]

1. Rh8 Kg7 2. Bh7 {draw - no gain}

[Result "23"]
[FEN "8/8/R7/1b4k1/5p2/1B3r2/7P/7K w - - "]

1. h4+ Kxh4 2. Rh6+ Kg5 3. Rh5+ {draw - no gain}

[Result "24"]
[FEN "7Q/4p3/4p3/p1p1P3/Pp2P3/3Kp3/p1PbP3/kN6 w - - "]

1. Na3 bxa3 2. Qh1+ Kb2 3. Qa1+ {draw - no gain}

[Result "25"]
[FEN "7r/K7/5k1n/p3p3/Pp1pPp1p/1PpP1PpP/2P3P1/N1RR1B2 b - - "]

{win}

[Result "26"]
[FEN "q7/b1p5/kp1p4/p2PN3/PPP5/1K6/8/5B2 w - - "]

1. c5+ Kb7 2. Ba6+ {win - no draw}

[Result "27"]
[FEN "1k1n4/1p1b1p2/1Bp1pPp1/1PP1P3/8/6P1/8/1K6 w - - "]

1. Bc7+ Ka7 2. Bb8+ {win - no draw}

[Result "28"]
[FEN "4q1kr/p6p/1prQPppB/4n3/4P3/2P5/PP2B2P/R5K1 w - - "]

1. Qxe5 {win}

[Result "29"]
[FEN "q1b4n/1p1pKp2/1p1p1Pp1/1P1P2Pp/2P4P/8/7R/1N1k4 w - - "]

1. Ra2 {win}

[Result "30"]
[FEN "3k4/2pq3p/pp5R/4P3/P6P/2PN4/1PN3K1/8 w - - "]

1. Nd4 {win}

[Result "31"]
[FEN "8/7p/6pP/p4pP1/3BpP2/p1KpP3/pn1N4/k7 w - - "]

1. Bh8 {win}

[Result "32"]
[FEN "8/6p1/p7/rp1K2p1/kb3pP1/2p2p1b/P1Np1P2/3N2R1 w - - "]

1. Ke6 {or 1. Ke4 win}

[Result "33"]
[FEN "B7/p1p5/k2p4/p3p3/P1Nb1p2/6p1/7p/4K3 w - - "]

{Ke1->h3->c8 win}

[Result "34"]
[FEN "1qN5/b1pB4/1pP2k2/pP3P2/P1P5/8/8/K7 w - - "]

{Ka1->h5->d8 win}

[Result "35"]
[FEN "8/3P3k/n2K3p/2p3n1/1b4N1/2p1p1P1/8/3B4 w - - "]

1. Nf6+ {win}

[Result "36"]
[FEN "8/5K2/3p3p/3p3P/pp1P4/rkb1R3/p1p3P1/n1B2B2 w - - "]

1. Rd3 {win}

[Result "37"]
[FEN "6bn/p4p1k/rp3Pp1/rp2BBP1/1p6/pK6/P2P4/8 w - - "]

1. Bc8 {win}

[Result "38"]
[FEN "qn6/b1Kp3p/p1pB3p/p7/P1NkP3/2pP4/2B5/8 w - - "]

1. Bf4 {or 1. Kc8 win}

[Result "39"]
[FEN "8/P7/4k3/8/5P2/4Bq2/5P2/5K2 b - - "]

1... Kf5 {win}

[Result "40"]
[FEN "8/6kP/1p6/p7/Pr6/K2B4/8/8 b - - "]

1... Rh4 {next Kg7->f6->e5 win}

[Result "41"]
[FEN "8/8/2b1N3/5p2/3B4/2K5/6kp/R7 w - - "]

1. Rh1 {win}

[Result "42"]
[FEN "8/8/4kpp1/3p1b2/p6P/2B5/6P1/6K1 b - - "]

1... Bh3 {win}

[Result "43"]
[FEN "5rk1/5ppp/p1Q1p3/1R6/q7/4b1P1/P2RPP1P/6K1 w - - "]

1. Rd8 {win}

[Result "44"]
[FEN "r7/1b1r4/k1p1p1p1/1p1pPpPp/p1PP1P1P/PP1K4/8/4Q3 w - - "]

1. Qa5+ {draw - no gain}

[Result "45"]
[FEN "3B4/1r2p3/r2p1p2/bkp1P1p1/1p1P1PPp/p1P4P/PPB1K3/8 w - - "]

1. Ba4+ {draw - no gain}

[Result "46"]
[FEN "2k5/2p5/1q1p4/pPpPp1pp/N1P1Pp2/P4PbP/KQ4P1/8 w - - "]

{avoid Nxb6+ win}

[Result "47"]
[FEN "1r6/4k3/r2p2p1/2pR1p1p/2P1pP1P/pPK1P1P1/P7/1B6 b - - "]

1... Rxb3+ {win}

[Result "48"]
[FEN "8/5k2/6p1/4BP1p/6p1/p1p3PP/6P1/1n2K2R b K - "]

1... a2 2. fxg6+ Kg8 {win}

[Result "49"]
[FEN "8/3k1b1r/2p1p1p1/rpPpPpPp/p2P1P1P/P2K4/8/4B3 w - - "]

1. Bb4 {draw - no gain}

[Result "50"]
[FEN "7b/p1p1p3/P1PpPp2/2nP1kpr/5P1p/p3KBPP/P7/8 w - - "]

1. Be4+ {draw - no gain}

[Result "51"]
[FEN "7r/p1p1p1pk/3pPp1p/2pP1PP1/P1P4P/1K6/P6B/8 w - - "]

1. g6+ Kg8 2. a5 a6 3. Bxd6 {or 2. Bxd6 cxd6 3. h5 draw - no gain}

[Result "52"]
[FEN "8/1p1q1k2/1Pp5/p1Pp4/P2Pp1p1/4PpPp/1N3P1P/3B2K1 w - - "]

1. Bb3 Qc8 2. Nd1 Qa8 3. Bc4 {draw - no gain}

[Result "53"]
[FEN "8/8/2pk4/8/p1p3B1/PpP5/1P6/r1NK4 w - - "]

1. Bf5 Ra2 2. Nxa2 bxa2 3. Kc1 a1Q+ 4. Bb1 {draw - no gain}

[Result "54"]
[FEN "1R3b2/5ppQ/6Pp/6PP/R6P/P7/7K/2q1k3 w - - "]

1. Rb1 Qxb1 2. gxf7 {win}

[Result "55"]
[FEN "Kn6/8/8/3R2PB/8/2p2NP1/1q6/2k5 w - - "]

1. Rd1+ {draw - no gain}

[Result "56"]
[FEN "1B3B1B/2B5/p6B/8/8/8/8/1k1K4 w - - "]

1. Bce5 {win}

[Result "57"]
[FEN "4kr2/5p1K/3p1Q2/1p4P1/4P3/1PP5/7b/8 w - - "]

1. Kh6 {win}

[Result "58"]
[FEN "6R1/8/2pB3k/2P4p/5p1q/5P2/4P1K1/8 w - - "]

1. Bf8+ {win}

[Result "59"]
[FEN "n2Bqk2/5p1p/Q4KP1/p7/8/8/8/8 w - - "]

1. Qc8 Kg8 2. Bc7 {win}

[Result "60"]
[FEN "8/5p2/8/8/p7/rpK4p/1p3ppr/bQ1N1bqk w - - "]

1. Kb4 {or 1. Kd4 win}

[Result "61"]
[FEN "8/8/7p/3KNN1k/2p4p/8/3P2p1/8 w - - "]

1. Kc6 {draw - no gain}

[Result "62"]
[FEN "1R6/pPk1r3/2p5/K7/8/2B1b3/8/8 w - - "]

1. Ka6 {draw - no gain}

[Result "63"]
[FEN "8/p7/qkpN1p2/8/1B1P4/PP3K2/5P2/8 w - - "]

1. Ba5+ {win}

[Result "64"]
[FEN "2N5/p7/P7/8/1KPp1p1p/3p1Bpp/3P2rq/R5bk w - - "]

1. Nb6 {win}

[Result "65"]
[FEN "5kN1/3p1q2/5P2/5PP1/2pK4/1p1R4/1P6/8 w - - "]

1. Rxb3 {win}

[Result "66"]
[FEN "2b1rk2/5p2/p1P5/2p2P2/2p5/7B/P7/2KR4 w - - "]

1. f6 {win}

[Result "67"]
[FEN "2r5/prkpR1p1/2p1ppK1/P1p1N1B1/P1P1P3/8/8/8 w - - "]

1. Bf4 {win}

[Result "68"]
[FEN "8/8/8/5Bp1/7k/7P/4pPK1/8 b - - "]

1... g4 {win}

[Result "69"]
[FEN "3k4/4pp2/n2n4/5BN1/3N4/b7/4K3/8 w - - "]

1. Nxf7+ {draw - no gain}

[Result "70"]
[FEN "8/1P6/8/1b1K4/6p1/5pP1/5P1B/7k w - - "]

1. b8R {win}

[Result "71"]
[FEN "8/5pKN/5Pp1/5kP1/8/Bb6/8/7q w - - "]

1. Bc5 {any move} Qxh7+ {Black wins}

[Result "72"]
[FEN "8/p5p1/1pP3p1/p5p1/k3p3/4p3/K7/8 w - - "]

1. c7 {win}

[Result "73"]
[FEN "q7/8/2p5/B2p2pp/5pp1/2N3k1/6P1/7K w - - "]

1. Ne4+ Kh4 2. Ng3 fxg3 3. Bb6 {draw - no gain}

[Result "74"]
[FEN "q7/7R/k7/1p6/1p6/1P2B3/7K/8 w - - "]

1. Bd4 {win}

[Result "75"]
[FEN "1q1r3k/3P1pp1/ppBR1n1p/4Q2P/P4P2/8/5PK1/8 w - - "]

1. Rxf6 {win}

[Result "76"]
[FEN "1r3q1k/2N2P1p/6pQ/4p3/7p/n6P/3B4/7K w - - "]

1. Qf4 {win}

[Result "77"]
[FEN "5nr1/2Pp2pk/3Pp1p1/4P1P1/6P1/5K2/8/7n w - - "]

1. c8N {win}

[Result "78"]
[FEN "2K3k1/1p6/R3p1p1/1rB1P1P1/8/8/1Pb5/8 w - - "]

1. Rc6 {draw - no gain}

[Result "79"]
[FEN "4q3/2r1r2p/3P3P/1p6/kP6/Pp6/1P6/KB2R3 w - - "]

1. Rxe7 Qxe7 2. dxc7 {draw - no gain}

[Result "80"]
[FEN "3k4/8/7p/2p1p1pP/1pPpPpP1/1P1P1P2/N7/2K5 w - - "]

{Na2->h4 win - gain}[/pgn]
The test doesn't contain middle-game tactical positions and technical endgames.
Here are only positions dedicated to test so-called by me quasi-intelligent abilities of engines.
Don't use such an external tricks like: multiPV, rule 50, null-move disabling, special parameters and others.
Tablebases and "Monte Carlo" are not welcome too.
The time to solve each of items should be 30 minutes for 1 000 000 nodes/second speed. It means 3 minutes for 10 000 000 nodes/second only. Of course, the going on last depth should not be broken.
The draw result means ZERO score or a missing gain.
The win result means the correct solution line mainly.
Here are rather easy, sometimes specially simplified be me, examples of possible problems for a clessic model of engines.
The spectrum of examples (80 items) and estimated time of solving are not accidental.

Sting SF 9.8 updates methods for fortress and pawn wall positions.

[Werewolf]

[d]2r5/6pk/7p/8/8/7P/1rb1RRPK/8 w - - 0 1


Any chance a position like this could be looked at?

[MikeGL]

Thanks for this update Marek!

[Leo]

chinese sacrifices ? What is that?

[lech]

chinese sacrifices ? What is that?

Something, what likes chinese snooker.
Sacrifices give a material, chinese sacrfices don't get a material.

[Paloma]

or did I miss something

[lech]

chinese sacrifices ? What is that?

Something, what likes chinese snooker.
Sacrifices give a material, chinese sacrfices don't get a material.

example:
[d]2k5/2p5/1q1p4/pPpPp1pp/N1P1Pp2/P4PbP/KQ4P1/8 w - -
White avoids Nxb6 (chinese sacrifice) to try to win!

[lech]

[d]2r5/6pk/7p/8/8/7P/1rb1RRPK/8 w - - 0 1
Any chance a position like this could be looked at?

Where is a problem?

The draw result means ZERO score or a missing gain.

[Leo]

chinese sacrifices ? What is that?

Something, what likes chinese snooker.
Sacrifices give a material, chinese sacrfices don't get a material.

example:
[d]2k5/2p5/1q1p4/pPpPp1pp/N1P1Pp2/P4PbP/KQ4P1/8 w - -
White avoids Nxb6 (chinese sacrifice) to try to win!

Strange.

[Werewolf]

[d]2r5/6pk/7p/8/8/7P/1rb1RRPK/8 w - - 0 1
Any chance a position like this could be looked at?

Where is a problem?


Sting thinks this is winning for black, but actually it's dead drawn.