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Thomas J. McElmurry's correct solution to DX Problem 7 appears in the game rules (near the end of the Notes section). Tom discovered an interesting truth regarding draws in certain 'King + Spider' versus 'King + Crab + Spider' Endgames. Tom, many thanks for the valuable analysis.
Despite my unintentionally erroneous, and therefore misleading hint,Thomas J. McElmurry correctly solved the DX 7 problem by proving White can force a draw. Black can only win if White plays inferior moves. The solution will be posted tomorrow evening. So, I find it interesting that I failed to solve my own problem :( . For those who still want to solve problem 7, the question should be: How can White force a draw? Note that the position will be reduced to King, Crab, and Spider versus King and Spider because White cannot prevent the loss of his pawn.
A note to DX problem solvers: I have received one potential solution - however, it argues that the game can only be 'drawn' by black with best play. My solution shows a black win. I will investigate later today to find out who is right. It is possible I was tricked by my own problem... but I hope not. If that is the case I will let you know and hang my head low. (to be continued...)
So far I have received no correct solutions to Problem # 7. The previous 6 problems had been solved within a day or two after posting... so maybe this one is too hard... but let me assure you, it is not actually hard, but it is very different from the others. I will provide a hint below. Unless anyone wants more time I will post the solution on July 14. Hint: Unlike previous problems, this one actually takes several moves and involves manuevering in Dimension X. The problem begins with a shown pawn move for White, and then Black can win regardless of what White does, if he (or she) uses the proper technique. Note: Since the diagrams from problems 1 through 6 have been removed for bandwidth help, I will try to use Forsythe text descriptions and re-add them in text format (sometime before the weekend). I believe the problems (along with Tom's analysis) are a good teaching aid to this game. Best regards. gkg
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