Fascinating Game (Knight En Prise for a long time)

[Eraserheads]

It's been ages since I posted here, but I occasionally check new posts and I've recently tried to accustom myself with the latest and the greatest in the computer chess kingdom. I've got myself an Ipad and I was blown away at how portable gadgets like these can play extremely good chess. My current setup nowadays just kicks my rig 10 years ago, and while before I was satisfied at seeing 500kn/s - 1k/s, nowadays even my former number crunching king Little Goliath gets kicked badly with typical speeds such as 4k/s on a single core (my rig now uses a 6-core processor).

I've installed the latest Stockfish for Ipad and pit it against my old stable from the mid 2000s (ruffian, Chess tiger, Junior, Hiarcs etc). Incredible result for my Ipad warrior, as it beat all the old warriors convincingly without losing a single game. ( I manually entered the moves ) My oh my times have changed and tech has improved dramatically. I gradually toughened the roster using more modern engines like Critter 1.6a, Shredder 13 etc and the Ipad either beat them or drew, still no losses. Truly this is a GM in my pocket! (coat pocket to be exact)

Now here is the only game it lost. I always manually enter their moves so I can enjoy the games as it happens. Here is an interesting game wherein Stockfish had its knight on g4 for a good several moves before finally sacrificing it on f2. It is quite a thriller, as taking the knight anytime would have resulted in a strong Kingside attack for Black.

The moves are as follows:

[pgn][Event "Blitz 5m"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "Komodo 13 64-bit"] [Black "Stockfish for Ipad Air 2"] [Result "*"] [PlyCount "89"] [TimeControl "300"] {510MB, Nimzo8.ctg, DESKTOP-G97S2CJ} 1. Nf3 {0} d5 {4} 2. e4 {0} dxe4 {8} 3. Ng5 {0} e5 {3} 4. Nxe4 {7} f5 {7} 5. Ng3 {1} Nf6 {15} 6. Bb5+ {0} c6 {9} 7. Bc4 {9} f4 {9} 8. Nh5 {9} Ng4 {2} 9. O-O {5} Qh4 {11} 10. h3 {8} Qxh5 {2} 11. Re1 { 5} Qg5 {17} 12. d4 {9} h5 {21} 13. Nd2 {8} Nd7 {20} 14. Nf3 {7} Qh6 {4} 15. Qe2 {12} Bd6 {17} 16. Qd3 {6} Bc7 {15} 17. Qb3 {11} Kd8 {11} 18. Bd2 {0} g5 {25} 19. Rad1 {10} b5 {9} 20. Bf7 {15} Bb6 {13} 21. c4 {0} bxc4 {9} 22. Qxc4 {0} a5 {6} 23. Be6 {1} Nxf2 {9} 24. Kxf2 {7} g4 {4} 25. Nxe5 {2} Nxe5 {7} 26. Rxe5 {0} Qf6 {16} 27. Re4 {0} Re8 {6} 28. Qxc6 {3} Rxe6 {11} 29. Qxa8 {0} Rxe4 {9} 30. Qxe4 {0} Bxd4+ {8} 31. Be3 {0} fxe3+ {6} 32. Kg1 {0} Qf2+ {5} 33. Kh1 {3} gxh3 {7} 34. Qxd4+ {0} Ke7 {3} 35. Qc5+ {5} Kf7 {3} 36. Qxh5+ {3} Kg7 {5} 37. Qf3 {6 } Qxf3 {9} 38. gxf3 {0} Bb7 {4} 39. Kh2 {7} Bxf3 {3} 40. Re1 {5} e2 {3} 41. Kxh3 {1} a4 {6} 42. Kg3 {8} Bh5 {5} 43. Kf2 {7} Kf6 {4} 44. Rxe2 {1} Bf7 {9} ( 44... Bg6 {0} 45. a3 {3} Bd3 {4} 46. Rd2 {7} Bc4 {8} 47. Ke3 {12}) 45. a3 {0} * [/pgn]

[Vinvin]

And with a deeper analyze, SF thinks 23...Nxf2 is a mistake and it wants to let the knight en prise for some more moves

Code: Select all

FEN: r1bk3r/3n4/1bp1B2q/p3p1pp/2QP1pn1/5N1P/PP1B1PP1/3RR1K1 b - - 1 23
Stockfish_19082608_x64_bmi2:
...
  39/47	07:54	 3.043.243k	6.408k	 0,00	23. ... Ra7 24.Qxc6 Rc7 25.Qd6 Qf8 26.Qxf8+ Nxf8 27.Bxc8 Kxc8 28.hxg4 hxg4 29.Nxg5 Ng6 30.Rc1 g3 31.fxg3 Bxd4+ 32.Kf1 fxg3 33.Ke2 Bxb2 34.Rxc7+ Kxc7 35.Rf1 Nf4+ 36.Bxf4 exf4 37.Ne6+ Kc6 38.Kf3 Be5 39.Rc1+ Kd6 40.Nxf4 Rf8 41.Rc4 Rxf4+ 42.Rxf4 Bxf4 43.Kxf4 a4 44.Kg4 Kc6 45.a3 Kb5 46.Kxg3