The Engine Crackers (2)

[Glarean]

... have again received two friends:
https://glarean-magazin.ch/2020/06/12/c ... s-puzzles/

I will update this page regularly with new puzzles.
It's best to check back from time to time.

Regards: Walter

[pgn][Event "D. Perry - L. Tinture, Corr 2018"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "The Engine Crackers 005"]
[Black "www.glarean-magazin.ch"]
[Result "*"]
[Annotator "W. Eigenmann & Computer"]
[SetUp "1"]
[FEN "2r2r2/p2qnpbk/1pn3p1/2pNp2p/P1P1P3/3P1P2/3N1BPP/R2Q1R1K w - - 0 21"]
[PlyCount "19"]

21. g4 $1 Nb4 $2 (21... hxg4 22. fxg4 f6 23. Be3 Kg8 24. Rg1 Nb4 (24... Nd4 25.
Rg2 Ne6 (25... Rce8 26. h4 Ne6 27. a5 Nxd5 28. cxd5 Nf4 29. Rh2 $16) 26. a5 Rb8
27. axb6 axb6 28. Rb1 Nf4 29. Bxf4 exf4 30. Nxf4 $18) 25. a5 bxa5 (25... Rb8
26. Qe2 g5 27. Nf1 Ng6 28. axb6 axb6 29. Ng3 $16) 26. Nf3 Nbxd5 27. cxd5 Nxd5
28. exd5 Qxd5 29. Rg2 $16) 22. Ra3 hxg4 (22... Nexd5 23. exd5 Bh6 24. Rg1 $18)
23. fxg4 f6 (23... Nec6 24. a5 Nxa5 25. Bh4 f6 26. Nxf6+ Rxf6 27. Bxf6 Nxd3 28.
Qa1 $18) (23... Nexd5 24. exd5 Bh6 25. Rg1 $18) 24. a5 Rb8 25. Be3 Nec6 26.
axb6 axb6 27. Rb3 Kg8 (27... Qd8 28. Nf3 Nxd5 29. cxd5 Nd4 30. Rb2 Bh6 31. Nxd4
cxd4 32. Bxh6 Kxh6 33. Ra2 $18) 28. Rb2 Ne7 29. Qe2 Nexd5 (29... Rb7 30. Nxb4
cxb4 31. Rxb4 $18) 30. exd5 $18 *[/pgn]
2r2r2/p2qnpbk/1pn3p1/2pNp2p/P1P1P3/3P1P2/3N1BPP/R2Q1R1K w

______________________________________

[pgn][Event "R. Cvak - T. Kubicki, Corr 2019"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "The Engine Crackers 006"]
[Black "www.glarean-magazin.ch"]
[Result "*"]
[Annotator "W. Eigenmann & Computer"]
[SetUp "1"]
[FEN "1rb1r3/5qk1/3b2p1/1PnPp1Pp/4B3/pP3Q2/P2N1B1P/1KR3R1 b - - 0 32"]
[PlyCount "13"]

32... Qxf3 $1 33. Bxf3 Bf5+ 34. Ka1 (34. Rc2 Rf8 35. Bxc5 Bxc5 36. Rgc1 Bxc2+
$19) 34... e4 35. Bd4+ (35. Nc4 Bxh2 $19) 35... Kg8 36. Be2 (36. Rxc5 Bxc5 37.
Bxc5 Rxb5 38. b4 exf3 39. Nxf3 Rb7 $19) 36... Nd3 37. Rc6 (37. Nc4 Nxc1 38.
Rxc1 Bxh2 39. Nxa3 e3 $19) 37... Bxh2 38. Rf1 (38. Rh1 Bf4 39. Nc4 Rxb5 $19)
38... Nb4 $19 *[/pgn]
1rb1r3/5qk1/3b2p1/1PnPp1Pp/4B3/pP3Q2/P2N1B1P/1KR3R1 b

.

[Vinvin]

[d]1rb1r3/5qk1/3b2p1/1PnPp1Pp/4B3/pP3Q2/P2N1B1P/1KR3R1 b
.

15 billion nodes with 2 best moves with SF.
Sf agrees that Qxf3 is the best move.

Code: Select all

FEN: 1rb1r3/5qk1/3b2p1/1PnPp1Pp/4B3/pP3Q2/P2N1B1P/1KR3R1 b - - 0 1
Stockfish_20060117_x64_modern:
...
 49/82	32:29	14 736 933 389	7 558 808	-1,04	1. ... Nxe4 2.Qxf7+ Kxf7 3.Nxe4 Bf5 4.Rc4 Rxb5 5.Re1 Rxd5 6.Kc1 Be7 7.Nf6 Rd3 8.Bg3 Bxf6 9.gxf6 e4 10.Bh4 e3 11.Rd1 Rxd1+ 12.Kxd1 Rd8+ 13.Ke1 Bg4 14.Rc7+ Kf8 15.Kf1 Rd1+ 16.Kg2 Rd2+ 17.Kg3 Rxa2 18.Ra7 e2 19.Ra8+ Kf7 20.Ra7+ Ke8 21.Re7+ Kf8 22.Bg5 e1Q+ 23.Rxe1 Re2 24.Rxe2 Bxe2 25.Be3 Kf7 26.Kf4 Kxf6 27.Bd4+ Ke6 28.Kg5 Bd3 29.Bc3 Bc2 30.h4 Bf5 31.Bf6 a2 32.Bd4 Bc2 33.Bb2 Kd5 34.Bc3 Bd3 35.Bb2 Bf5 36.Kf4 Bc2 37.Kg5 Bxb3
 49/82	32:29	14 736 933 389	7 558 808	-1,78	1. ... Qxf3 2.Bxf3 Bf5+ 3.Ka1 e4 4.Bd4+ Kg8 5.Be2 Nd3 6.Rc6 Bxh2 7.Rh1 Bf4 8.Nc4 Rxb5 9.d6 Rd5 10.Be3 Bg3 11.Kb1 Rd8 12.Nxa3 R5xd6 13.Rxd6 Bxd6 14.Nc2 Be5 15.Bb6 Rc8 16.Ne3 Kg7 17.Ba7 Be6 18.Nc2 Bf4 19.Bd4+ Kf7 20.Rf1 Bf5 21.Ne3 Bxe3 22.Bxe3 h4 23.Rh1 h3 24.Rh2 Ke6 25.Bf1 Ke5 26.a4 Rc3 27.Bxh3 Rxb3+ 28.Ka2 Rc3 29.Bd2 Rc2+ 30.Kb3 Rxd2 31.Rxd2 Bxh3 32.Kc3 Kf4 33.Rh2 Bd7 34.a5 Bb5 35.Kd4 e3

[zullil]

... have again received two friends:
https://glarean-magazin.ch/2020/06/12/c ... s-puzzles/

I will update this page regularly with new puzzles.
It's best to check back from time to time.

Regards: Walter

[pgn][Event "D. Perry - L. Tinture, Corr 2018"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "The Engine Crackers 005"]
[Black "www.glarean-magazin.ch"]
[Result "*"]
[Annotator "W. Eigenmann & Computer"]
[SetUp "1"]
[FEN "2r2r2/p2qnpbk/1pn3p1/2pNp2p/P1P1P3/3P1P2/3N1BPP/R2Q1R1K w - - 0 21"]
[PlyCount "19"]

21. g4 $1 Nb4 $2 (21... hxg4 22. fxg4 f6 23. Be3 Kg8 24. Rg1 Nb4 (24... Nd4 25.
Rg2 Ne6 (25... Rce8 26. h4 Ne6 27. a5 Nxd5 28. cxd5 Nf4 29. Rh2 $16) 26. a5 Rb8
27. axb6 axb6 28. Rb1 Nf4 29. Bxf4 exf4 30. Nxf4 $18) 25. a5 bxa5 (25... Rb8
26. Qe2 g5 27. Nf1 Ng6 28. axb6 axb6 29. Ng3 $16) 26. Nf3 Nbxd5 27. cxd5 Nxd5
28. exd5 Qxd5 29. Rg2 $16) 22. Ra3 hxg4 (22... Nexd5 23. exd5 Bh6 24. Rg1 $18)
23. fxg4 f6 (23... Nec6 24. a5 Nxa5 25. Bh4 f6 26. Nxf6+ Rxf6 27. Bxf6 Nxd3 28.
Qa1 $18) (23... Nexd5 24. exd5 Bh6 25. Rg1 $18) 24. a5 Rb8 25. Be3 Nec6 26.
axb6 axb6 27. Rb3 Kg8 (27... Qd8 28. Nf3 Nxd5 29. cxd5 Nd4 30. Rb2 Bh6 31. Nxd4
cxd4 32. Bxh6 Kxh6 33. Ra2 $18) 28. Rb2 Ne7 29. Qe2 Nexd5 (29... Rb7 30. Nxb4
cxb4 31. Rxb4 $18) 30. exd5 $18 *[/pgn]
2r2r2/p2qnpbk/1pn3p1/2pNp2p/P1P1P3/3P1P2/3N1BPP/R2Q1R1K w

Stockfish-dev:

info depth 39 seldepth 57 multipv 1 score cp 93 lowerbound nodes 8932282165 nps 37821409 hashfull 769 tbhits 0 time 236170 pv g2g4

and eventually

info depth 56 seldepth 83 multipv 1 score cp 147 nodes 184919925643 nps 40568157 hashfull 1000 tbhits 0 time 4558253 pv g2g4 h5g4 f3g4 f7f6 f2e3 c6b4 a1b1 e7c6 d2f3 c6a5 d1e2 a5b7 f3d2 f8f7 f1f2 c8f8 h2h4 d7a4 f2h2 f8h8 b1f1 h7g8 h4h5 g6g5 h2f2 b4d5 e4d5 b7d6 d2e4 d6e4 d3e4 f7f8 e2f3 a4d7 f1a1 f8a8 f2a2 g8h7 h1g2 h8b8 g2g3 b8b7 f3f1 a8f8 a2f2 b7b8 f2b2 h7g8 b2h2 f8f7 h2f2 b8f8 a1b1 g8h7 f1d3 h7h8 b1a1 h8g8 a1f1 g7h6 e3d2 h6g7 d2c3

[MMarco]

[d]1rb1r3/5qk1/3b2p1/1PnPp1Pp/4B3/pP3Q2/P2N1B1P/1KR3R1 b
.

15 billion nodes with 2 best moves with SF.
Sf agrees that Qxf3 is the best move.

Code: Select all

FEN: 1rb1r3/5qk1/3b2p1/1PnPp1Pp/4B3/pP3Q2/P2N1B1P/1KR3R1 b - - 0 1
Stockfish_20060117_x64_modern:
...
 49/82	32:29	14 736 933 389	7 558 808	-1,04	1. ... Nxe4 2.Qxf7+ Kxf7 3.Nxe4 Bf5 4.Rc4 Rxb5 5.Re1 Rxd5 6.Kc1 Be7 7.Nf6 Rd3 8.Bg3 Bxf6 9.gxf6 e4 10.Bh4 e3 11.Rd1 Rxd1+ 12.Kxd1 Rd8+ 13.Ke1 Bg4 14.Rc7+ Kf8 15.Kf1 Rd1+ 16.Kg2 Rd2+ 17.Kg3 Rxa2 18.Ra7 e2 19.Ra8+ Kf7 20.Ra7+ Ke8 21.Re7+ Kf8 22.Bg5 e1Q+ 23.Rxe1 Re2 24.Rxe2 Bxe2 25.Be3 Kf7 26.Kf4 Kxf6 27.Bd4+ Ke6 28.Kg5 Bd3 29.Bc3 Bc2 30.h4 Bf5 31.Bf6 a2 32.Bd4 Bc2 33.Bb2 Kd5 34.Bc3 Bd3 35.Bb2 Bf5 36.Kf4 Bc2 37.Kg5 Bxb3
 49/82	32:29	14 736 933 389	7 558 808	-1,78	1. ... Qxf3 2.Bxf3 Bf5+ 3.Ka1 e4 4.Bd4+ Kg8 5.Be2 Nd3 6.Rc6 Bxh2 7.Rh1 Bf4 8.Nc4 Rxb5 9.d6 Rd5 10.Be3 Bg3 11.Kb1 Rd8 12.Nxa3 R5xd6 13.Rxd6 Bxd6 14.Nc2 Be5 15.Bb6 Rc8 16.Ne3 Kg7 17.Ba7 Be6 18.Nc2 Bf4 19.Bd4+ Kf7 20.Rf1 Bf5 21.Ne3 Bxe3 22.Bxe3 h4 23.Rh1 h3 24.Rh2 Ke6 25.Bf1 Ke5 26.a4 Rc3 27.Bxh3 Rxb3+ 28.Ka2 Rc3 29.Bd2 Rc2+ 30.Kb3 Rxd2 31.Rxd2 Bxh3 32.Kc3 Kf4 33.Rh2 Bd7 34.a5 Bb5 35.Kd4 e3

That was a tough one. I used a Cfish derivative for android (Spider 1.1.6) whith "ICCF Analyses = 1" (i think it works similarly to Bluefish tactical settings), King Safe = 200, Lazy threshold=off on my tablet (4 cores, 512M hash). It took 20 billion nodes to see the light! :

Code: Select all

Spider 1.1.6 E.O.
[47] -1.35 Dxf3 Fxf3 Ff5+ Ra1 e4 Fd4+ Rg8 Fe2 Cd3 Tc6 Fxh2 Tf1 Cb4 Fe3 Tbd8 Cc4 Txd5 Tb6 Td7 Fc1 e3 Fxa3 Cc2+ Rb2 Cxa3 Rxa3 h4 Tf3 Td2 Cxd2 exd2 Fd1 h3 Txf5 gxf5 Th6 Te1 Txh3 Fd6+ Rb2 Txd1 Rc2 Ta1 Rxd2 Txa2+ Rc3 Tg2 b6 Rf7 Th6 Fe5+ Rc4 Td2 Rb5 f4 Th3 Rg6 Rc6 Rxg5
[47] -1.22 Cxe4 Dxf7+ Rxf7 Cxe4 Ff5 Tc4 Txb5 Te1 Txd5 Rc1 Fe7 Cf6 Fxf6 gxf6 Rxf6 h4 Ted8 Fe3 T8d7 Ta4 Tc7+ Tc4 Txc4+ bxc4 Td7 Fg5+ Re6 Te3 Fd3 Tf3 e4 Tf6+ Re5 Ta6 Fxc4 Ta5+ Td5 Txa3 Rf5 Ta4 Td4 Ta8 Rg4 Td8 Txd8 Fxd8 e3 Rd1 Rf3 Re1 Fxa2 Fg5 e2 Fd2 Fe6 Fc1 Ff5 Fg5 Fe4 Fd8 Re3 Fg5+ Rd3 Rf2
d:48/84 1:Dxf3 t:11081 n:20114M nps:1815k tb:2473k h:100

[48] -1.78 Dxf3 Fxf3 Ff5+ Ra1 e4 Fd4+ Rg8 Fe2 Cd3 Tc6 Fxh2 Tf1 Cb4 Fc5 Fe5+ Rb1 Cxc6 dxc6 e3+ Txf5 gxf5 Fxe3 Fc7 Fc4+ Rg7 Fa7 h4 Fxb8 Txb8 Ff1 Rg6 Cf3 Te8 Cxh4+ Rxg5 Cf3+ Rf4 b6 Fxb6 Cd2 Te6 Fb5 Te5 Fa4 Te1+ Rc2 Rg3 b4 f4 Fb5 f3 Fd3 Ta1 Rb3 Rf4 Cc4 Fc7 Cxa3 f2 Cb5 Td1 Fc4 Tb1+ Ra4 Fe5
[48] -1.25 Cxe4 Dxf7+ Rxf7 Cxe4 Ff5 Tc4 Txb5 Te1 Txd5 Rc1 Fe7 Cf6 Fxf6 gxf6 Rxf6 h4 Ted8 Tc7 Td3 Fe3 T8d5 Fh6 Re6 Ff8 e4 Fxa3 Ta5 Rb2 Td2+ Rc3 Tad5 Fe7 Txa2 Fg5 Td3+ Rb4 Ta8 Rc4 Re5 Tc5+ Rd6 Ff4+ Re7 Te3 Rf7 Txd3 exd3 Tc7+ Rg8 Rb4 Ta2 Tc5 Rf7 Rc3 Re6 Te5+ Rf6 Td5 Rg7 Fe3 Tc2+ Rb4
d:49/75 1:Dxf3 t:17837 n:32333M nps:1812k tb:3641k h:100

[zullil]

[pgn][Event "R. Cvak - T. Kubicki, Corr 2019"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "The Engine Crackers 006"]
[Black "www.glarean-magazin.ch"]
[Result "*"]
[Annotator "W. Eigenmann & Computer"]
[SetUp "1"]
[FEN "1rb1r3/5qk1/3b2p1/1PnPp1Pp/4B3/pP3Q2/P2N1B1P/1KR3R1 b - - 0 32"]
[PlyCount "13"]

32... Qxf3 $1 33. Bxf3 Bf5+ 34. Ka1 (34. Rc2 Rf8 35. Bxc5 Bxc5 36. Rgc1 Bxc2+
$19) 34... e4 35. Bd4+ (35. Nc4 Bxh2 $19) 35... Kg8 36. Be2 (36. Rxc5 Bxc5 37.
Bxc5 Rxb5 38. b4 exf3 39. Nxf3 Rb7 $19) 36... Nd3 37. Rc6 (37. Nc4 Nxc1 38.
Rxc1 Bxh2 39. Nxa3 e3 $19) 37... Bxh2 38. Rf1 (38. Rh1 Bf4 39. Nc4 Rxb5 $19)
38... Nb4 $19 *[/pgn]
1rb1r3/5qk1/3b2p1/1PnPp1Pp/4B3/pP3Q2/P2N1B1P/1KR3R1 b

This one seems much more challenging, at least based on one search by Stockfish-dev:

info depth 67 seldepth 94 multipv 1 score cp 153 lowerbound nodes 241876088542 nps 48121521 hashfull 1000 tbhits 0 time 5026360 pv f7f3

and eventually

info depth 72 seldepth 116 multipv 1 score cp 283 nodes 2352611946589 nps 47148735 hashfull 1000 tbhits 0 time 49897668 pv f7f3 e4f3 c8f5 b1a1 e5e4 f2d4 g7g8 c1c5 e4f3 d2f3 d6c5 d4c5 b8b5 b3b4 b5b7 f3d4 e8e5 d4c6 e5e2 h2h4 e2h2 c6e7 g8h7 e7f5 g6f5 g5g6 h7g8 a1b1 h2b2 b1c1 b2a2 g1g3 f5f4 g3d3 g8g7 d5d6 b7d7 c1b1 a2b2 b1c1 b2g2 d3a3 g7g6 b4b5 g2g3 c1d2 g3a3 c5a3 d7f7 d2e2 f4f3 e2f2 g6f5 f2f3 f5e6 f3e4 f7a7 a3c5 a7a5 c5f2 a5b5 f2g3 b5a5 e4e3 a5a3 e3f2 e6f5 g3h2 a3b3 f2e2 f5e6 h2f4 b3h3 d6d7 e6d7 f4g5 h3b3 e2f2 b3b5 g5f4 b5b2 f2e3 d7e6 e3f3 b2b3 f3e4 b3b4 e4f3 e6f5 f4g5 f5e5 f3f2 e5d6 f2f3 b4b3 f3g2 d6e6 g2f2 b3b5 f2e2

Wonder if endgame tables would have made a significant difference ...

[Pafifi]

[pgn]
[FEN "2r2r2/p2qnpbk/1pn3p1/2pNp2p/P1P1P3/3P1P2/3N1BPP/R2Q1R1K w - - 0 1"]

1. g4 hxg4 2. fxg4 f6 3. Be3 Kg8 4. Rg1 Nb4 5. a5 bxa5 6. Nf3 Nbxd5 7. cxd5 Nxd5 8. exd5 Qxd5 9. Rg2
[/pgn]
The advantage seems insignificant?