A square (more chess)

 
Yes, it is possible to build a 5x5 pawn-square in 21,5 moves...

1.g4/Nf6 2.c3/Ne4 3.Qb3/Ng5 4.Qb6
4.../axQ 5.Bg2/Ra3 6.Bc6/Rb3
7.axR/bxB 8.Ra5/Ba6 9.Rc5/Bc4 10.Nf3/Na6 11.Nd4
11.../bxR 12.bxB/Qb8 13.b4
13.../cxN 14.h4/Nc5
15.bxN/QxN 16.hxN/Qf5 17.Rh6/Qf3 18.Rg6
18.../hxR 19.exQ/Rh3 20.d3/Rg3 21.Be3
21.../dxB 22.fxR 
(I guess a lot of distinct variants are possible – but can this be achieved in less than 21,5 moves?)

























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