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Since you are using an if-elseif statement, the elseif code will not get executed when the if code has been executed. If you change your elseif to an if (and close off the previous if with an endif), you can see that it does immediately recognize the change in the variable's value. As your code exists, it is still going to create an infinite loop. Note that this is actually an infinite meta-loop, not a loop inside the program. For each move, Game Courier constructs and runs a GAME Code program from the beginning. Each time it runs this program, the flag firstturn gets turned on, causing your 'if flag firstturn' code to run. Since extendmove appears in this code block, it constructs and runs a new GAME Code program before bringing you to the Verify form. It then executes extendmove again, and again and again for each new move you make, adding all the moves into one long move statement for White's first move. If you replace your firstturn flag with a firstturn constant whose value you change once by deleting it and creating it again with a new value, this should break you out of the infinite loop. Unlike a variable, a constant exists in the log, and you can change what its value will be at the beginning of the program used for subsequent moves. What I have done instead of this in my old Korean Chess preset is to use extendmove only when certain moves are made, which I then translate into other moves that do not call on the use of extendmove.