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16-07-2022 Herman Spanjer:
b.o. 4. 20-15
16-07-2022 Aleksandr Vlasenko:
Yes, of course, it is possible 4. 20-14 23-29 5. 14-10 or 4. 20-15 23-29 5. 15-10, etc.  According to the international rules of CPI FMJD (clause 1.9), this is a dual of the type: alternative move (clause 1.9.1). I proceeded from the fact that the master rules CPI FMJD (RM) allow one type of duality: clause 1.17.2. f) in the development of the Endgame position the Dual is absent or at most one type of Dual occurs etc.