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Game Courier Developer's Guide. Learn how to design and program Chess variants for Game Courier.[All Comments] [Add Comment or Rating]I've gotten closer to isolating the problem. The PHP language construct isset returns false when a variable exists but has a null value, and I had been expecting it to return true whenever a variable exists no matter what it's value is. So, in the code you gave, the local a2 had a null value, and isset failed to recognize that it existed. I need to replace my uses of isset with something else, maybe array_key_exists, but I will continue work on it later.