A New Twenty: 5 + 15

h#5+15

[Black makes 5 consecutive moves, then White mates in 15 consecutive moves]

Anticirce

Without white King

Black: 1. Kh8 2. Rh7 3. Rf7 4. d4 5. Be4

White: 1.b2-b4 2.b4*c5[wPc5->c2] 3.c2-c3 4.c3*d4[wPd4->d2] 5.d2-d3 6.d3*e4[wPe4->e2] 7.e2-e4 8.e4-e5 9.e5-e6 10.e6*f7[wPf7->f2] 11.f2-f4 12.f4-f5 13.f5-f6 14.f6-f7 15.f7-f8=Q #