SwitchingQuylthulg: [Event "CG.com Masters vs. Machines Invitational"]
[Site "Yahoo! Chess"]
[White "Kutztown46 / Stockfish"]
[Black "Hosea / Allies"]
[Annotator "His Majesty George V, by the Grace of Accident, of the United Kingdom of Great Britain and Ireland and of the British Dominions beyond the Seas, King, Defender of the Opening, Emperor of India"]
<1. e4 e5?!>
Mankind entered this game trailing Aylerkupp / Rybka by half a point, so a more dynamic opening, such as the Owen, might have been called for.
<2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4>
Initially suggested by yours truly, purely as a joke! Amazingly enough (or perhaps not...) <Open Defence> actually went for it.
<6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Nbd2>
<Eric Schiller>, who reappeared after being absent for a while, already disliked Black's position here somewhat.
<Open Defence> suggested 9...Be7, but Schiller strongly supported
the text. Clocks: 1:40 - 1:28
<10. c3 d4 11. Bxe6 Nxe6 12. cxd4 Ncxd4 13. Ne4 Be7 14. Be3 Qd5>
Home prep by <OD>, and a ChessGames database novelty.
<15. Nxd4 Qxe4 16. Nxe6 fxe6 17. Qh5+>
White here had several interesting alternatives, including 17.Rc1 and 17.Re1.
<17...g6 18. Qh3 Qxe5 19. Rfe1 Qf5 20. Qxf5
gxf5 21. Bd4 O-O 22. Rxe6 Rfe8>
<Open Defence> was still in prep...
<23. Rc6 Bd6 24. Kf1!?>
A surprise to Houdini and Hosea alike. In retrospect it was probably a good move, though not quite enough to confuse the human team into losing.
A very long think - curiously it took 8 minutes into the discussion
for a serious alternative to be suggested! At that point, <Open Defence> started championing for 24...Kf7. To me, the stated reasoning of "avoiding Bc5" seemed rather curious, as I felt the move would merely make Bc5 more effective! (It should, however, still be good enough for a draw.) Mankind eventually spent some 20 minutes on this move, easily the carbon units' longest think in the tournament. Clocks: 1:15 - 0:52
Houdini's evals here rose markedly at deep depths, but Black remains in draw territory.
<25...Rae8 26. g3 Bxg3>
This rather simple ploy was initially missed by mankind's finest, but eventually spotted by <wwall>. The rook endgame should be drawn with best play. Clocks: 1:10 - 0:44
(Missing the tactic wouldn't have been any instant disaster, as 26...a5 followed by 27...a4 appears to be a legit alternative.)
<27. hxg3 Rd8 28. Rdc1>
Both 28.Rxc7 and 28.Rxa6 are very playable alternatives. Indeed, the strongest absolute continuation was probably 28.Rxa6 Rexd4 29.Rxd4! Rxd4 30.Ke2, but even then White appears unlikely to win.
<28... Rexd4 29. Rxa6 Rd1+ 30. Rxd1 Rxd1+>
Black spent 43 seconds on this move...
<31. Ke2 Rc1 32. Kd2 Rf1 33. Ke3 Re1+ 34. Kf4 Re2 35. f3 Rxb2 36. Kxf5 Kf8 37. g4 b4 38. Ra7 Rc2 39. Ra4 Rc4 40. f4 Kf7>
Clocks: 0:48 - 0:26
In post-game analysis Stockfish turned to 41.Ke5, which is indeed a better move but still only draws.
<41...h6 42. a3 bxa3>
<wwall>'s 42...c5 was also playable. <Open Defence> thought 43.Ra7+ looked dangerous... I'd be dangerous with a shotgun!
<43. Rxa3 Rc5+ 44. Ke4 Rc4+ 45. Kf3 Rc6 1/2-1/2>