Author: John Merlino
Date: 17:36:53 03/01/01
Go up one level in this thread
On February 28, 2001 at 14:33:56, Sune Larsson wrote: > > [D]3r4/7p/Rp4k1/5p2/4p3/2P5/PP3P1P/5K2 b - - 0 1 > > This is Tarrasch-Rubinstein, San Sebastian 1911. > Black is a pawn down and the b6 pawn is under attack. Passive > defence with 1.-Rd6 or 1.-Rb8 is doomed to failure. Rubinstein > grasps his only chance: To mobilize his rook and king. > Activity is vital in rook endings. > > 1.-Rd2! 2.Rxb6+ Kg5 3.Ke1 [3.a4 f4 4.a5 f3! is more than welcome to black.] > 3.-Rc2 4.Rb5 Kg4! 5.h3+ Kxh3 6.Rxf5 Rxb2 and black drew without effort. > > > Test: Big + for your program if it chooses 1.-Rd2! combined with > activating the king. > > Thumbs down if it chooses passive defence with 1.-Rd6 or 1.-Rb8. > > Sune No luck for CM8000: Time Depth Score Positions Moves 0:00 4/6 0.81 33344 1...Rb8 2. c4 Kg5 3. Ke2 Kf4 4. b4 Ke5 0:00 5/7 0.89 68365 1...Rd6 2. a4 Rf6 3. a5 bxa5 4. Rxa5 Rc6 5. Ke2 0:01 6/8 1.47 149422 1...Rd6 2. a4 Kg5 3. a5 Rd1+ 4. Ke2 Ra1 5. Rxb6 Rxa5 6. b4 0:02 6/8 0.98 186247 1...Rb8 2. c4 Kf7 3. b4 Ke8 4. Ra7 h5 5. c5 f4 0:05 7/9 1.02 453839 1...Rb8 2. b4 Kg5 3. a4 Kf4 4. Ke2 h5 5. a5 bxa5 6. Rxa5 0:10 8/10 1.02 953564 1...Rb8 2. b4 Kg5 3. a4 Kf4 4. Ke2 h5 5. a5 bxa5 6. Rxa5 0:25 9/11 1.11 2487975 1...Rb8 2. b4 Kg5 3. a4 Kf4 4. Ke2 h5 5. a5 bxa5 6. Rxa5 h4 7. Rc5 1:28 10/12 1.11 8400433 1...Rb8 2. b4 Kg5 3. a4 Kf4 4. Ke2 h5 5. a5 bxa5 6. Rxa5 h4 7. Rc5 3:38 11/13 1.16 20507267 1...Rb8 2. b4 Kg5 3. a4 Kg4 4. Ke2 h5 5. a5 bxa5 6. Rxa5 Kf4 7. Rc5 h4 11:16 12/14 1.20 62370843 1...Rb8 2. b4 Kg5 3. a4 Kg4 4. a5 bxa5 5. Rxa5 h5 6. b5 Kh3 7. c4 Kxh2 8. c5 Rh8 jm
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