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Jesper Norgaard
30-07-2009, 06:12 AM
I was Black a few days ago in the Oaxaca tourney. I had played the opening quite clueless where I should have chosen a different path at least two times before. Still I played a good move here - what is Black's best move?

r3k2r/2pqbppp/p2p4/1p1P1b2/8/1N6/PPP1QPPP/R1B1R1K1 b kq - 0 15

Please use white text as this is not the most difficult position. How could white try to refute Black's play, and which variation would result with best play?

Desmond
30-07-2009, 09:23 AM
...0-0 looks tempting, if Qxe7 then Rae8 skewering the queen to the nack rank threat.

Jesper Norgaard
30-07-2009, 09:37 AM
...0-0 looks tempting, if Qxe7 then Rae8 skewering the queen to the nack rank threat.


Yes I played 15...0-0 which is the best move aiming the skewer. However there is a caveat, White can try 16.g4 since after 16...Bg6 White has a loophole with 17.Qxe7 Rae8?? 18.Qxd7 Rxe1+ 19.Kg2 or after 16...Bxg4 17.f3 he get's the possibility of Qxe7-h4xe1 etc.

Desmond
30-07-2009, 09:46 AM
15...0-0 16.g4 Bxg4 17.f3 Bh4 if 18.fxg4 Rae8

Igor_Goldenberg
30-07-2009, 10:25 AM
1...0-0 2.g4 Bg6 3.Qxe7 Qxg4+ with at least a perpetual check

Jesper Norgaard
30-07-2009, 10:41 AM
15...0-0 16.g4 Bxg4 17.f3 Bh4 if 18.fxg4 Rae8


Yes 15...0-0! is right and giving Black an equal game and chances for more with the pair of Bishops. After 16.g4 Bxg4! is the right move. 16...Bg6? 17.Qxe7 Qxg4+ 18.Kf1 Qh3+ 19.Kg1 will give Black perpetual check, and if he doesn't continue checking he will probably lose. Actually I would have disliked that because I wanted to play for a win - in the end it was a draw all the same. But 16...Bg6? is a mistake because 16...Bxg4! is winning after 17.f3 Bh4! 18.fxg4 Bxe1 19.Qxe1 Qxg4+ 20.Kh1 Qf3+ 21.Kg1 Qxd5. From that position I reckoned that the 3 pawns and Rook against Knight and Bishop was a winning advantage. However, my faithful box likes the positional 20...Rfe8 21.Qf1 Re2 better - but I suspect that is just because it calculated it could get even more pawns :owned:

Boris final move 18...Rae8 is a mistake because after 19.Be3! Black does not even get one pawn back (e.g. 19...Bxe1 20.Rxe1). Saw that during the game.

Igor_Goldenberg
30-07-2009, 10:47 AM
I missed that bishop protects the queen and thought after 15...0-0 16.g4 Bxg4 white wins with 17.Qxe7. What a silly oversight:wall:

Jesper Norgaard
30-07-2009, 03:51 PM
I missed that bishop protects the queen and thought after 15...0-0 16.g4 Bxg4 white wins with 17.Qxe7. What a silly oversight:wall:

Yes if Black did not have Bxd7 after playing Rxe1+ it would not work. Also it is important that White does not have Kf2 which would answer Bxd7 with Kxe1. Talking about silly oversights my only loss in the Oaxaca tourney was when I had a hallucination in a drawish Rook endgame, where I planned 1...c6-c5 and calculated that he could not play 2.Rxc5 Rxc5 3.Rxc5 Kxc5 but then instead grabbed the Rook (instead of pawn c6) and brought it over to c5 just to realize that this would just lose the rook to Rxc5. Instead I had to play 1...Rh5-d5 2.Rxc6+ and with the pawn lost the game was lost some 20 moves later. Alzheimer? :wall: