Author: Matthias Gemuh
Date: 00:24:00 04/03/04
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On April 02, 2004 at 21:39:14, Dan Honeycutt wrote: >This post is for other beginners like myself. You veterans are welcome to read >and laugh but no comments are necessary. > >I recently checked to see how my engine was doing in a test match and found it >in a dead-drawn, blocked-pawn, opposite-color bishop ending. The other engine >showed a draw score but poor Bruja, clueless, thought it had a slight advantage >and wanted to fight on. I thought about adjudicating but browsing the score >showed nothing had happened for some time so I figured the game had to soon end >by 3 rep or 50 move rule. > >Then I noticed the output. Bruja was reeling off plys like pennies at the gas >pump with today's high prices. My first thought was "wow, hash tables really >help in these positions with so few pieces". I became uneasy when the depth >passed 20 and downright worried when it passed 40. Terror gripped my heart when >the depth flew past my array dimensions. I watched helpless, waiting for the >crash and wondering what was wrong with my bounds checks. > >After iteration 379 Bruja decided it had searched deep enough and played. The >other engine replied and the game ended in a 50 move draw. The postmortem was, >fortunately, fairly simple. I had bounds checks in the search but nothing in >the iteration function. Iterate called search which promptly returned as all >moves led to a draw two plys. Iterate incremented the depth, recalled search >with the same result until the time allocation finally ran out. (I should have >noticed that the whole time the pv was only 2 moves but i was fixated on the >depth.) > >Others with green engines may want to check to see that they don't have a >similar situation. > >Dan H.
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