Author: Robert Hyatt
Date: 10:11:44 12/03/99
Go up one level in this thread
On December 02, 1999 at 16:29:55, Howard Exner wrote:
>These positions from the recent games posted by Enrique are about
>sacrificing pieces for pawns. In line with recent threads here about sacs that
>either fail or succeed, see what you make of these.
>
>Black played Ng5 and lost. The connected passed pawns on the Queenside for
>compensation
>were not enough this time, but given a similar position the sac may well have
>been justified.
>2r2rk1/1b3ppp/pq1b1n2/1pnPp3/1P2P3/2N2N2/3B1PPP/RB1QR1K1 b - b3 id "RTiger
>PII-300/64MB - Shredder 4 PIII-500"; am f6g4;
where did the above FEN come from? the "b3" on the end is wrong. There is
no possible en-passant capture on b3.
Crafty never considers Ng4 here... It only considers Ncd7..
>
>Black played a5 but here looks like a good time to play g5. Black might squirm
>out of the checks and remain a piece up for two pawns.
>r3r1k1/p4bp1/1ppq3p/3nRQ2/3P1p1B/5N2/PP3PPP/4R1K1 b - - id "Shredder 4 PIII-500
>- RTiger PII-300/64MB"; bm g7g5;
>
g5 is all I get here:
nss depth time score variation (1)
6 0.37 0.44 1. ... g5 2. Qg4 Qg6 3. Nxg5 hxg5 4.
Bxg5
6-> 0.40 0.44 1. ... g5 2. Qg4 Qg6 3. Nxg5 hxg5 4.
Bxg5
7 0.78 0.49 1. ... g5 2. Qg4 Qg6 3. Bxg5 Rxe5 4.
Rxe5 hxg5 5. Nxg5
7-> 0.83 0.49 1. ... g5 2. Qg4 Qg6 3. Bxg5 Rxe5 4.
Rxe5 hxg5 5. Nxg5
8 2.38 0.41 1. ... g5 2. Bxg5 hxg5 3. Nxg5 Bg6
4. Qg4 Rad8 5. Ne6
8-> 2.64 0.41 1. ... g5 2. Bxg5 hxg5 3. Nxg5 Bg6
4. Qg4 Rad8 5. Ne6
9 4.14 0.38 1. ... g5 2. Bxg5 hxg5 3. Nxg5 Bg6
4. Qg4 Qf6 5. Ne6 f3
9-> 5.13 0.38 1. ... g5 2. Bxg5 hxg5 3. Nxg5 Bg6
4. Qg4 Qf6 5. Ne6 f3
10 10.11 0.41 1. ... g5 2. Bxg5 hxg5 3. Qg4 Qf6 4.
Rxg5+ Kf8 5. Ne5 Be6 6. Qh5 Rac8
10-> 11.54 0.41 1. ... g5 2. Bxg5 hxg5 3. Qg4 Qf6 4.
Rxg5+ Kf8 5. Ne5 Be6 6. Qh5 Rac8
11 18.48 0.30 1. ... g5 2. Bxg5 hxg5 3. Nxg5 Bg6
4. Qg4 Qf6 5. Ne4 Qg7 6. Nd6 <HT>
>Black avoided g5 here also and I agree with that choice.
>r5k1/2r2bp1/1ppq3p/p2nN3/3PRp1B/7Q/PP3PPP/4R1K1 b - - id "Shredder 4 PIII-500 -
>RTiger PII-300/64MB"; am g7g5;
>
>Black plays g5 here and the game quickly ends in White's favour.
crafty takes over 30 seconds to get off of g5, although the score is not good
after 3 seconds (-.12) It changes to another move at depth=12, 30 seconds, as
by that time, the score for g5 is down to -.6. The above comment goes with the
FEN above... not the one below here...
>r1r3k1/5bp1/1ppq3p/p2n4/3PRp1B/5N1Q/PP3PPP/4R1K1 b - - id "Shredder 4 PIII-500 -
>RTiger PII-300/64MB"; am g7g5;
g5 drops at depth=11, after 10 seconds... It then switches off of that to
Rf8 and then Qc7...
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