reversal (Salazar)
Reciprocal change of the first and mating moves after the same defence in two phases.
Scheme:
1.A 1…a 2.B
1.B 1…a 2.A
threat-reversal
Reciprocal change of the first move and the threat in two phases.
Scheme:
1.A ~ 2.B
1.B ~ 2.A
Mlynka, Karol
Sachsische Zeitung, 1983
mate in 2 moves
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