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Subject: Re: So how do we tell when to avoid null-move?

Author: Dan Homan

Date: 13:18:47 11/05/99

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I missed an obvious simplification in my verification search.  Here
is the output of my program with Null Move - ON + verification search.
At large depths the speed here is much faster than the previous post
due to the simplification I found.

 - Dan

P.S.  Does anyone have any other good null-move killer positions to
suggest?

White-To-Move[1]: setboard 4q/p5p/k5P/8/1PN4K/8/1N2B/8 w - -
White-To-Move[1]: analyze
Analysis mode: Enter commands/moves as ready.

  1.  -0.29     0        5   1. b5+
  1.   0.69     0       20   1. Ne5+
  1.   0.74     0       38   1. Bh5
  1.   0.83     0       39   1. Bd3
  1.   0.83     0       47   1. Bd3
  2.  -0.09     0       97   1. Bd3 Qe7+
  2.   0.68     0      387   1. Ne3+ Kb7
  2.   0.76     0      661   1. Ne5+ Kb6
  2.   0.76     0      664   1. Ne5+ Kb6
  3.   0.77     0     1126   1. Ne5+ Kb7 2. Bf3+
  3.   0.77     0     1746   1. Ne5+ Kb7 2. Bf3+
  4.   0.72     0     2877   1. Ne5+ Kb7 2. Nbd3 Qd8+
  4.   0.72     0     4944   1. Ne5+ Kb7 2. Nbd3 Qd8+
  5.   0.67     0    13867   1. Ne5+ Kb6 2. Nbd3 Qe7+ 3. Kg4
  5.   0.67     0    19104   1. Ne5+ Kb6 2. Nbd3 Qe7+ 3. Kg4
  6.   0.70     0    29093   1. Ne5+ Kb6 2. Nbd3 Qb5 3. Kg4 a5
  6.   0.70     0    43143   1. Ne5+ Kb6 2. Nbd3 Qb5 3. Kg4 a5
  7.   0.72     0    65244   1. Ne5+ Kb6 2. Nbd3 Qb5 3. Kg4 a5 4. ba5+
  7.   0.72     0    91558   1. Ne5+ Kb6 2. Nbd3 Qb5 3. Kg4 a5 4. ba5+
  8.   0.72     0   130795   1. Ne5+ Kb6 2. Nbd3 Qb5 3. Kg4 a5 4. ba5+ Kc7
  8.   0.72     1   199550   1. Ne5+ Kb6 2. Nbd3 Qb5 3. Kg4 a5 4. ba5+ Kc7
  9.   0.73     1   300281   1. Ne5+ Kb6 2. Nbd3 Qb5 3. Kg4 a5 4. ba5+ Kc7
                             5. Bf3
  9.   2.33     1   321411   1. b5+ Qxb5 2. Nd3 Qxc4+ 3. Nf4 Qxe2 4. Nxe2 Kb6
                             5. Nd4
  9.   2.33     2   442444   1. b5+ Qxb5 2. Nd3 Qxc4+ 3. Nf4 Qxe2 4. Nxe2 Kb6
                             5. Nd4
 10.   5.47     3   654531   1. b5+ Qxb5 2. Nd3 Qb8 3. Nc5+ Kb5 4. Ne5+ Kc5
                             5. Nd7+ Kd6
 10.   5.47     5   970055   1. b5+ Qxb5 2. Nd3 Qb8 3. Nc5+ Kb5 4. Ne5+ Kc5
                             5. Nd7+ Kd6
 11.   5.48     5  1087464   1. b5+ Qxb5 2. Nd3 Qb8 3. Nc5+ Kb5 4. Ne5+ Kc5
                             5. Nd7+ Kd6 6. Nxb8
 11.   5.48     8  1730080   1. b5+ Qxb5 2. Nd3 Qb8 3. Nc5+ Kb5 4. Ne5+ Kc5
                             5. Nd7+ Kd6 6. Nxb8
 12.   5.38    17  3297167   1. b5+ Qxb5 2. Nd3 Qb1 3. Nc5+ Kb5 4. Na3+ Kc5
                             5. Nxb1 a5 6. Nc3 Kb4
 12.   5.38    26  5215345   1. b5+ Qxb5 2. Nd3 Qb1 3. Nc5+ Kb5 4. Na3+ Kc5
                             5. Nxb1 a5 6. Nc3 Kb4
 13.   4.24    40  8066130   1. b5+ Qxb5 2. Nd3 Qxc4+ 3. Nf4 Qxe2 4. Nxe2 Kb6
                             5. Kg5 a5 6. Nd4 a4 7. Nf5
 13.   4.24    62 12650000   1. b5+ Qxb5 2. Nd3 Qxc4+ 3. Nf4 Qxe2 4. Nxe2 Kb6
                             5. Kg5 a5 6. Nd4 a4 7. Nf5
 14.   4.88    65 13394715   1. b5+ Qxb5 2. Nd3 Qxc4+ 3. Nf4 Qxe2 4. Nxe2 Kb6
                             5. Nf4 a5 6. Nd5+ Kc5 7. Ne7 a4
 14.   4.88   103 21601996   1. b5+ Qxb5 2. Nd3 Qxc4+ 3. Nf4 Qxe2 4. Nxe2 Kb6
                             5. Nf4 a5 6. Nd5+ Kc5 7. Ne7 a4



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