Once again I (black) got in trouble after my opponent engaged multiple threads at once with 20. f4:
Who is the one in trouble?
I used up almost all my time to think of a way out. Usually there is one in such a situation. But I didn’t see that actually there was not only a way to get out with minor material disadvantage, but even with a significant advantage!
Black to move and win material.
Hint: showBlack can pin the white knight in two moves. Then use a (threat of a) fork to gain advantage of that pin.
Solution: show20 … Na5 prepares a pin of the white knight to the white king with one of the rooks. Moving the knight away does not work: 21. Nd3 Rhc8+ 22. Kd1 Qa4+, which uses the black queen to fork the white king and the white rook and wins a rook.
Those two major threats considered, this is a reasonable continuation: 20. … Na5 21. fxe5+ Kg7 22. e6. After this delay black has a chance to play out his advantages: 22. … Rhc8 23. Qc3+ Qxc3+ 24. bxc3 Rxc5 25. Rxf7+ Kh6
My own “solution” was a bit puny. If you look at how I won, please consider that after that situation I had only two minutes left :-) show
[Event "rated standard match"]
[Site "Free Internet Chess Server"]
[Date "2008.08.05"]
[Round "?"]
[White "bobbilipili"]
[Black "Magnakai"]
[Result "0-1"]
[WhiteElo "1584"]
[BlackElo "1722"]
[ECO "B54"]
[TimeControl "1200+20"]
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 a6 5. c4 g6 6. Be3 Bg7 7. Nc3 Nf6 8.
Qd2 Nc6 9. f3 e5 10. Nb3 Be6 11. O-O-O Ke7 12. Bh6 $2 {Crafty (score -0.14 at
depth 11) thinks this is not a good move} ({Crafty suggests:} 12. g4 b5 13.
Nd5+ Bxd5 14. exd5 Na7 15. c5 Qc7 16. c6 Rhc8 $16 {(score 1.14 at depth 9)} )
Bxh6 13. Qxh6 Qb6 14. c5 dxc5 15. Qe3 Nd7 16. Na4 Qb4 17. Naxc5 Nxc5 18. Nxc5
Bxa2 19. Rd7+ Kf6 20. f4 $4 {Crafty (score -3.75 at depth 9) thinks this is a
blunder} ({Crafty suggests:} 20. Rxb7 Qd4 21. Qxd4 Nxd4 22. b4 Rhc8 23. Rb6+
Be6 24. Bxa6 Rc7 25. Rd6 $11 {(score 0.05 at depth 10)} ) Rhd8 $4 {Crafty
(score -0.15 at depth 9) thinks a good move has been missed} ({Crafty
suggests:} 20. ... Na5 21. fxe5+ Kg7 22. e6 Rhc8 23. Qc3+ Qxc3+ 24. bxc3 Rxc5
25. Rxf7+ Kh6 26. c4 Bxc4 27. Bxc4 Rxc4+ $19 {(score -3.75 at depth 9)} ) 21.
fxe5+ Kg7 22. Rxb7 Qd4 23. Ne6+ $4 {Crafty (score -5.36 at depth 12) thinks
this is a blunder} ({Crafty suggests:} 23. Qxd4 Nxd4 24. b3 Rac8 25. Kb2 Rxc5
26. Kxa2 Ra5+ 27. Kb2 Rxe5 28. Bc4 Ne6 29. Bxa6 Rxe4 $11 {(score -0.13 at
depth 11)} ) Kg8 $4 {Crafty (score 5.77 at depth 11) thinks this is a
blunder} ({Crafty suggests:} 23. ... Bxe6 24. Qxd4 Rxd4 25. Rc7 Nxe5 26. g3
Rc8 27. Rxc8 Bxc8 28. Bg2 Bb7 29. Rd1 Rc4+ 30. Kd2 Bxe4 31. Bxe4 Rxe4 $19
{(score -5.36 at depth 12)} ) 24. Nxd4 Rxd4 $4 {Crafty (score 9.95 at depth
12) thinks this move loses more quickly} ({Crafty suggests:} 24. ... Nxd4 25.
Rc7 Rab8 26. Rc3 a5 27. Bc4 Bxc4 28. Rxc4 Nb3+ 29. Kc2 Rd2+ 30. Qxd2 Nxd2 31.
Kxd2 Rxb2+ $18 {(score 5.77 at depth 10)} ) 25. Rc7 $4 {Crafty (score 7.02 at
depth 10) thinks this is not the quickest way to win} ({Crafty suggests:} 25.
Rb6 Rc8 26. Bxa6 Nxe5+ 27. Bxc8 Rc4+ 28. Kd2 Rxc8 29. b3 Bxb3 30. Qxb3 Nc4+
31. Ke2 Nxb6 32. Qxb6 $18 {(score 9.95 at depth 12)} ) Bb3 $4 {Crafty (score
11.16 at depth 10) thinks this move loses more quickly} ({Crafty suggests:}
25. ... Na5 26. Be2 Rad8 27. Rd1 Nb3+ 28. Kc2 Rxd1 29. Bxd1 $18 {(score 7.02
at depth 10)} ) 26. Rxc6 $4 {This offers a mate in 1 to the opponent}
({Crafty suggests:} 26. Be2 a5 27. Rxc6 Rb4 28. Rf1 Rd8 29. Qf3 a4 30. Rd6
Rd4 31. Rxd8+ Rxd8 $18 {(score 11.16 at depth 10)} ) Rd1# {bobbilipili
checkmated} 0-1
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