Initial revision

lang/basic/test/checker.b.g

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+This program will play checkers. The computer us X,
+and you are 0. The computer will go first, -note: squares
+are printed in the form-(X,Y) and sq. 1.1 is the bottom left!
+do not attempt a double jump or your piece might just
+disappear (same for triple!)
+	Wait for the computer to move!!!!!!
+
+retry
+
+retry
+
+retry
+
+retry
+
+retry
+
+retry
+
+retry
+
+retry
+
+retry
+
+retry
+
+retry
+
+retry
+
+retry
+
+retry
+LINE 11300:ERROR 1: RETURN without GOSUB