See end of game
[pgn]
[Event "Computer Chess Game"]
[Site "HP"]
[Date "2017.01.28"]
[Round "-"]
[White "Fairy-Max 4.8S"]
[Black "SkipperWinb"]
[Result "1/2-1/2"]
[TimeControl "120"]
[Annotator "1. +0.10 1... +0.03"]
1. d3 {+0.10/8} g6 {+0.03/121 2.0} 2. Bg5 {+0.09/8 5} c6 {+0.21/101 2.0} 3.
c4 {+0.12/7 1.5} Bg7 {+1.04/121 2.0} 4. Nc3 {-0.12/8 2.0} Qc7
{+0.44/101 1.9} 5. Nf3 {-0.08/7 1.4} d6 {+0.94/101 1.9} 6. Qa4 {-0.18/8 4}
h6 {+0.81/101 1.9} 7. Be3 {-0.05/8 1.5} h5 {+0.73/81 1.9} 8. Nd5
{+0.71/7 2.4} Qd7 {+0.51/101 1.8} 9. Nb6 {+1.46/11 2.4} axb6
{+0.76/121 1.8} 10. Qxa8 {+1.59/11 1.7} Bxb2 {+0.45/121 1.8} 11. Rb1
{+1.48/11 2.3} Bc3+ {-0.43/141 1.7} 12. Nd2 {+1.56/11 5} Na6
{-0.31/121 1.7} 13. Rxb6 {+1.58/11 11} Qc7 {-0.12/101 1.7} 14. Rb3
{+1.77/8 1.0} Ba5 {-0.29/101 1.7} 15. Ra3 {+1.66/9 1.4} Bb4 {-0.39/121 1.6}
16. Bb6 {+1.51/10 6} Qd7 {-0.27/121 1.6} 17. Rb3 {+1.57/10 2.1} Bc5
{-0.42/121 1.6} 18. Ne4 {+1.76/8 1.0} Bb4+ {-0.66/121 1.6} 19. Nc3
{+1.58/8 1.2} Bc5 {-0.48/121 1.5} 20. Na4 {+1.86/8 2.1} Bb4+
{-0.50/121 1.5} 21. Kd1 {+2.09/7 0.8} Nf6 {-0.71/101 1.5} 22. a3
{+2.11/8 2.8} Bc5 {-0.75/101 1.5} 23. d4 {+3.32/8 1.2} Ng4 {-2.31/121 1.5}
24. Ke1 {+3.40/9 1.7} Nc7 {-2.66/121 1.4} 25. Bxc7 {+3.68/9 0.9} Bxd4
{-3.08/101 1.4} 26. Bb6 {+3.84/8 1.0} Be5 {-3.19/101 1.4} 27. Ba7
{+4.04/8 1.4} Qf5 {-3.96/81 1.4} 28. f4 {+3.61/8 3} Bxf4 {-3.12/101 1.3}
29. Nb6 {+3.61/8 1.0} O-O {-3.16/121 1.3} 30. e3 {+1.18/7 1.2} Bxe3
{-0.12/101 1.3} 31. Be2 {-1.49/8 0.8} Qf2+ {+0.91/121 1.3} 32. Kd1
{-2.15/9 0.8} Qxg2 {+3.47/121 1.3} 33. Rf1 {-2.16/9 0.6} Bf5
{+3.28/121 1.3} 34. Qxb7 {-1.99/8 0.7} Bc2+ {+3.61/121 1.2} 35. Ke1
{-2.61/7 1.0} Bxb3 {+4.55/101 1.2} 36. Qxe7 {-4.03/7 0.6} Qxh2
{+6.99/101 1.2} 37. Rf3 {-8.40/9 1.0} Qg1+ {+8.18/121 1.2} 38. Bf1
{-10.42/10 1.5} Bxb6 {+8.40/121 1.2} 39. Bxb6 {-5.90/9 1.0} Qxb6
{+9.66/121 1.2} 40. Bd3 {-6.39/8 0.5} Ne5 {+10.44/101 1.1} 41. Rg3
{-6.69/9 0.7} Qa5+ {+10.85/121 1.1} 42. Ke2 {-7.72/8 0.9} Qxa3
{+10.90/101 1.1} 43. Qg5 {-6.74/8 0.7} Qc5 {+11.52/101 1.1} 44. Qf4
{-7.11/8 0.8} Bxc4 {+11.52/101 1.1} 45. Bxc4 {-6.49/9 0.6} Nxc4
{+11.60/101 1.0} 46. Qe4 {-6.64/8 0.6} d5 {+11.98/121 1.0} 47. Rg5
{-7.09/8 0.4} Qd6 {+11.81/101 1.0} 48. Qh4 {-7.28/8 0.5} Kh7
{+12.01/101 1.0} 49. Rg1 {-7.05/8 0.6} Rb8 {+11.83/101 1.0} 50. Kf1
{-7.34/7 0.7} d4 {+12.15/101 1.1} 51. Rg5 {-7.48/7 0.5} Ne3+
{+12.32/101 1.0} 52. Ke1 {-9.11/7 0.7} Rb2 {+2.70/141 1.0} 53. Rxh5+
{-0.05/12 0.5} gxh5 {+0.00/241 1.0} 54. Qxh5+ {-0.03/11 0.4} Qh6
{+0.00/261 1.0} 55. Qxh6+ {-0.01/13 1.4} Kg8 {+0.00/161 0.9} 56. Qg6+
{-0.01/9 0.4} fxg6 {+0.00/321 0.9}
{Xboard adjudication: Stalemate} 1/2-1/2
[/pgn]
Rabid Queen only
Moderators: hgm, Rebel, chrisw
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- Posts: 759
- Joined: Fri Jan 04, 2013 4:55 pm
- Location: Nice
Re: Rabid Queen only
after 52.Ke1 :
[d]1r6/5p1k/2pq2p1/6Rp/3p3Q/4n3/8/4K3 w - - 0 1
Isa play 53 .... Qb4!+ , force 53 Kf2
then It play 54 .... Ng4+ and white lose his Queen or is checkmate
What is a "rabid queen"?
So I think Skipper's move 52 ... Rb2 was a bug
[d]1r6/5p1k/2pq2p1/6Rp/3p3Q/4n3/8/4K3 w - - 0 1
Isa play 53 .... Qb4!+ , force 53 Kf2
then It play 54 .... Ng4+ and white lose his Queen or is checkmate
What is a "rabid queen"?
So I think Skipper's move 52 ... Rb2 was a bug
Isa download :
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- Location: Russia
Re: Rabid Queen only
A 'rabid' piece is one that checks the opponent's king continuously so that if the king takes it, the owner of the 'rabid' piece will be in stalemate, but if the king doesn't take it, it will be giving perpetual check.Daniel Anulliero wrote:What is a "rabid queen"?
A 'rabid rook' moving along the seventh rank and checking the king that moves along the eighth is a more common tactical theme than what happened in that game.
Technically, it's very seldom possible for a queen to become truly (perpetually) 'rabid' because, once it comes in direct contact with the king, the king most often has to take it, having no escape squares left. So Henk was calling that particular queen 'rabid' only figuratively.
Last edited by Tony P. on Sat Jan 28, 2017 10:57 pm, edited 2 times in total.
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- Posts: 7218
- Joined: Mon May 27, 2013 10:31 am
Re: Rabid Queen only
I get this now. Probably was a bug in futility pruning.
[d] 1r6/5p1k/2pq2p1/6Rp/3p3Q/4n3/8/4K3 b - - 0 1
[d] 1r6/5p1k/2pq2p1/6Rp/3p3Q/4n3/8/4K3 b - - 0 1
Code: Select all
Depth Value Time(seconds) Nodes
200 12.2020 41.36 5897262 b8b1 e1e2 b1b2 e2f3 c6c5 h4g3 d6f6 f3e4 f6e7 g3e5
180 12.3180 8.47 1099993 b8b1 e1e2 b1b2 e2f3 f7f5 h4e1 d6d5 f3g3 b2g2
160 12.3170 4.31 659085 b8b1 e1e2 b1b2 e2d3 b2b3 d3e2
140 12.3170 2.27 340128 b8b1 e1e2 b1b2 e2d3 b2b3 d3e2
120 12.1950 1.56 222470 b8b3 h4e4 f7f5 e4e7
100 12.4200 0.24 34899 b8b1 e1e2 b1b2 e2d3 c6c5
80 12.3640 0.14 23576 b8b1 e1e2 b1b2 e2e1
60 12.4290 0.02 1881 b8b1 e1d2 f7f5
40 12.3440 0.01 606 b8b1 e1d2
20 12.5350 0.04 186 d4d3
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- Posts: 216
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- Location: Russia
Re: Rabid Queen only
Congrats on fixing it! I find it instructive - engines can make the mistake of underestimating losing captures so much that they fail to see a sacrificial forced draw threatened by the opponent if the node where it happens is pruned or outside the main search tree.Henk wrote:Probably was a bug in futility pruning.
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- Posts: 759
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- Location: Nice
Re: Rabid Queen only
Thanks for your answerTony P. wrote:A 'rabid' piece is one that checks the opponent's king continuously so that if the king takes it, the owner of the 'rabid' piece will be in stalemate, but if the king doesn't take it, it will be giving perpetual check.Daniel Anulliero wrote:What is a "rabid queen"?
A 'rabid rook' moving along the seventh rank and checking the king that moves along the eighth is a more common tactical theme than what happened in that game.
Technically, it's very seldom possible for a queen to become truly (perpetually) 'rabid' because, once it comes in direct contact with the king, the king most often has to take it, having no escape squares left. So Henk was calling that particular queen 'rabid' only figuratively.
Isa download :
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- Posts: 759
- Joined: Fri Jan 04, 2013 4:55 pm
- Location: Nice
Re: Rabid Queen only
Yes Rb1 is better now but , the bug is not fixed !Tony P. wrote:Congrats on fixing it! I find it instructive - engines can make the mistake of underestimating losing captures so much that they fail to see a sacrificial forced draw threatened by the opponent if the node where it happens is pruned or outside the main search tree.Henk wrote:Probably was a bug in futility pruning.
Droidfish say the best move is effectively Qb4+ with M9
Isa find the best move but not the mate with 30"
Édit : After 240" it change for Ng2+ , M8
Isa download :
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- Location: United States
Re: Rabid Queen only
What did you change to get the new answer?Henk wrote:I get this now. Probably was a bug in futility pruning.
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- Posts: 7218
- Joined: Mon May 27, 2013 10:31 am
Re: Rabid Queen only
I changed something in futility pruning at level 1. But I changed it wrongly. So still not fixed. Maybe too difficult.zenpawn wrote:What did you change to get the new answer?Henk wrote:I get this now. Probably was a bug in futility pruning.
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- Posts: 7218
- Joined: Mon May 27, 2013 10:31 am
Re: Rabid Queen only
[d]1r6/5p1k/2pq2p1/6Rp/3p3Q/4n3/8/4K3 w - - 0 1Henk wrote:I changed something in futility pruning at level 1. But I changed it wrongly. So still not fixed. Maybe too difficult.zenpawn wrote:What did you change to get the new answer?Henk wrote:I get this now. Probably was a bug in futility pruning.
Added check extension. PV incomplete.
Code: Select all
Depth Value Time(seconds) Nodes
180 16.3840 12.14 1355795 d6b4
160 16.3840 2.57 302759 d6b4
140 16.3840 0.56 70942 d6b4
120 16.3840 0.19 20963 d6b4
100 12.0910 4.42 555601 e3c2
80 14.2680 3.16 395996 b8b1
60 12.5590 0.43 62897 b8b1
40 12.4140 0.06 7654 b8b1
20 12.4910 0.05 645 d4d3
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