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. Author manuscript; available in PMC: 2021 Apr 1.
Published in final edited form as: J Appl Behav Anal. 2019 Jul 22;53(2):835–845. doi: 10.1002/jaba.612

Figure 1.

Figure 1.

Illustration of the Queen’s Gambit. If black takes the pawn offered by white, the gambit is accepted. If black makes any other move, the gambit is denied. QG = Queen’s Gambit.