[computer-go] Bad effect when tree node limit reached

[Michael Williams]

My engine is basic UCT+MC.  I've been letting it ponder on small empty boards with a certain komi to see if it begins to converge to the correct position value. 
 It does as long as the tree is allowed to grow.  But as soon as the tree reaches its node limit (with simulations continuing), the position value begins to go 
back toward 0.5 (where 0 represents a white win and 1 represents a black win).  I would have expected the convergence to the correct value to continue at a 
slower rate or maybe just stay the same.  Is this a bug or can this effect be explained?
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