Stephen G Lukey vs Murray Chandler (2008)

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Stephen G Lukey vs Murray Chandler
New Zealand Championship (2008), Auckland, rd 2, Jan-16
Semi-Slav Defense: Anti-Moscow Gambit (D44) · 1-0

ANALYSIS [x]

FEN COPIED

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Jan-29-08		solstys: Is there a win here?

Jan-29-08		Gilmoy: Download PGN, load in Winboard, Save Position... as FEN: click for larger view Google "chess tablebase", find http://www.lokasoft.nl/tbweb.htm front-end to Nalimov tablebase (up to 5 pieces, so we qualify). Paste FEN, instant response: 66..Rh7! (! denotes only-move) draw 66..Re8 mate in 12 66..Re2/e3 mate in 3 (67.Rg1) 66..Rg7/Ke8 mate in 1 All other moves lose the rook. This position is a draw. Presumably Black has Rh6+ to keep White's K off f6, and White has no mating net.

Feb-03-08		solstys: Thanks!

Feb-10-08		Richard Taylor: Both players were in severe time trouble - I watched some of this game - and walked away thinking it was a draw - but I don't think the end position is a draw after Rh7 as I think Rg1 wins - or seems to...

Feb-10-08		Richard Taylor: Actually I played round with Win board and if Black is careful Rh7 may draw - hmm difficult OTB though! Esp short of time...

Feb-12-08		Gilmoy: 66..Rh7 is a tablebase draw. Consider a hypothetical web service front-end to the tablebase. You start with a board position (after 66..Rh7); let that be the first node of a graph. Brute-force expand all legal moves, generate their FENs, feed them all into the tablebase, and take the move with the best result for the moving player. (This will always be 0, given that Black can always avoid losing lines, and White never has a forced-win line.) Add all those new positions to the graph, linked by edges labeled with those moves. Repeat, building out the graph like an onion. This maps out a tiny subset of the chess search space. The tablebase result is equivalent to the lemma that this entire graph has value 0 (drawn) [in fact, that's exactly how the tablebase concluded the draw result in the first place]. We can conclude that one of the following must be true: a) Closure: This particular graph is closed -- at some point all nodes loop back into nodes already in the graph (including symmetrical positions via reflections or rotations). b) Remoteness: This graph has no win within radius 100(-ply) from the start node (so it's a 50-move draw). c) the tablebase is wrong :) (Not likely) Of course, humans don't memorize the tablebase, and OTB mistakes are always possible.

Sep-27-21		Jonathan Sarfati: AFAIK, Lukey is the only New Zealander to have beaten GM Chandler in a tournament or match game in 40+ years, and there have been many such games.

Jul-24-22		GrahamClayton: <Jonathan Sarfati> AFAIK, Lukey is the only New Zealander to have beaten GM Chandler in a tournament or match game in 40+ years, and there have been many such games. <Jonathan Sarfati> That's an amazing statistic - do you know what Chandler's record was doing that time?

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