Author: James Long
Date: 16:01:24 10/29/98
Hello all,
I've been playing a bit lately with extensions.
One issue I've been wrestling with is when to say "enough."
I limit the number of extensions that can be done
in one node to two ply. I'd be interested to hear
if anyone has played with limiting the extensions
throughout an entire branch.
The two problems below are from WAC. The first run
is from Tristram v3.37, the second from what will soon
be v4.0. In *this* case, the extensions appear to
be a win. Actually, they appear to be a win
throughout the suite, but I've seen a few instances
on ICC that the program appeared to take too long
to get through an iteration. Even though the second
run came up with a mate (an easy one), I'm concerned
with the fact that the first iteration went nine moves deep.
Similiar experiences?
position 009
3q1rk1/p4pp1/2pb3p/3p4/6Pr/1PNQ4/P1PB1PP1/4RRK1 b - - 0 1
solution is Bh2+
Depth Time Nodes Score Princ. Continuation
----- ---- ----- ----- -------------------
1 ... 0.00 226 -1.793 Rxg4
2 ... 0.04 462 -1.997 Rxg4 Bf4
3 ... 0.11 2970 199.991 Bh2+ Kh1 Bg3+
my move is Bh2+
[right][3][0.108][26283][3.00]
position 009
3q1rk1/p4pp1/2pb3p/3p4/6Pr/1PNQ4/P1PB1PP1/4RRK1 b - - 0 1
solution is Bh2+
Depth Time Nodes Score Princ. Continuation
----- ---- ----- ----- -------------------
1 ... 0.01 411 199.991 Bh2+ Kh1 Bg3+ Kg1 Rh1+ Kxh1 Qh4+ Kg1
Qh2#
my move is Bh2+
[right][1][0.014][15807][1.00]
---
James
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