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I must say in advance that I don't know much about using Chess engines.
anyway, I ran the initial position on Arena, with Rybka (free version), Houdini (free version) and Stockfish (latest version) running on it.
Computer is an old Pentium 4 (3.0 GHz, 1 GB RAM) .... Rybka found the combination in like 5 - 10 minutes and started calling it +4,
while even after 25 minutes have gone by now, both Houdini and Stockfish are still calling it -1 or -2 and show d8Q as the move.
Why is this ??? Aren't Stockfish DD and Houdini 1.5 supposed to be much better than Rybka 2.2, especially Stockfish since it is the latest version and it just came out.
woah! First to reply!
Now that I saw that he know that Nf6+ is the best move, I put it again to see which line it showed, it made this:
Doesn't quite fit in this segment of the chess forums, probably general chess discussion. This puzzle is Plaskett's puzzle or something and there's at least 1 more buried thread containing this puzzle xD. Somewhere.
The thing about the Houdini 4 Pro x64 BX analysis is that after 1.Nf6+ Kg7 2.Nh5+ Kg6 3.Bc2+ Kxh5 4.d8=Q is that doesn't Black wins at once with 4....Nf7+ and 5...Nxd8.
No. If you click on the ? on the OP's diagram, he explains why.
pawn cant queen because of Nf7+ 1. Nf6+The most forcing move . 1... Kg7the ONLY move, if King goes to back rank, pawn will queen with check. if king goes to g6, Bb5+, and after king moves pawn can queen as fork on f7 is covered by the bishop 2. Nh5+Kg6forced also as the king can't go to back rank as pawn will queen with check. 3. Bc2+Sac the Knight 3... Kxh54. d8=Qwhat is happening ?? 4... Nf7+no option really 5. Ke6Nxd8+6. Kf5Now look closely ! The black king is in a mating net here ! It cant move and white can bring in his bishop to give the fatal check ! 6... e2u might as well think black played this because he can't defend mate via Be4 and then Bf3 mate, but the fun is not over yet !! 7. Be4aiming for Bf3 mate ! 7... e1=NAN UNDERPROMOTION !! saves the mate at f3 ! 8. Bd5but the bishop has other squares from where it can deliver mate ! 8... c2u will see why this was played 9. Bc4Aiming for Be2 + 9... c1=NA SECOND UNDERPROMOTION !! saves the mate at e2! 10. Bb5aiming for Be8 mate ! 10... Nc7Knight rescues the day again ! guards e8 and attacks the bishop ! 11. Ba4THE FINAL BLOW !! aiming for Bd1 mate and black can drag this for two three moves 11... Ne2useless !! 12. Bd1Nf3useless again ! 13. Bxe2c4or for that matter any move would do !! 14. Bxf3# Possibly the Greatest Chess Puzzle ever !!
But yes, it needs to get to Depth 25 to discover the winning move.
The history behind the puzzle: In a great tournament, with players such as Kasparov, Karpov, Tal and those great giants, on the free day, a man did set up the pieces like this, and said noone could solve it. Karpov and Kasparov resigned after an hour, but Tal went for a walk, after ½ an hour he came back, and showed the solution. He was the only one who could sacrifice like that and still win.
So this puzzle is not new ? It was already invented ?
I have read that story, but didn't know which was the puzzle.
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