39,860 solutions = 5*E9 = (n/2)*E(n-1) for n=10.See Variantim 94 https://www.variantim.org/variantim-issues/stipulation dia 15.0forsyth 1s2kbrr/1pp2s1p/B3bq2/4pp2/3p4/3PP1Q1/1pPR1PPP/2BKS1SRconstraints Sb1(3..3) Sg1(0..0) Qd1(3..3) Ke1(1..1) Bf1(1..1) Bc1(2..2) Ra1(2..2) Pa2(1..1) Pd2(1..1) Pe2(1..1)constraints Ra8(3..3) Pa7(4..4) Pd7(2..2) Pe7(1..1) Pf7(1..1) Qd8(1..1) Bc8(1..1) Sg8(2..2)
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