MESON Chess Problem Database

Problem Display
PID: 179741 (nR1rB3/2PPPN2/bbk1N3/1p2p3/1p2P1nq/1K1Pp3/7B/8 w - - 0 1)

Kopnin, Aleksey Grigorevich

1st Prize, Sverdlovsk Ty., 1948

nR1rB3/2PPPN2/bbk1N3/1p2p3/1p2P1nq/1K1Pp3/7B/8

#2

11 + 11

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qe1
      • 2.exd8S#
    • 1...Qf2
      • 2.exd8S#
    • 1...Qg3
      • 2.exd8S#
    • 1...Qxh2
      • 2.exd8S#
    • 1...Qh3
      • 2.exd8S#
    • 1...Qh5
      • 2.exd8S#
    • 1...Qh6
      • 2.exd8S#
    • 1...Qh7
      • 2.exd8S#
    • 1...Qh8
      • 2.exd8S#
    • 1...Rxb8
      • 2.d8S#
    • 1...Rc8
      • 2.dxc8Q#
      • 2.dxc8S#
      • 2.dxc8B#
      • 2.dxc8R#
      • 2.d8Q#
      • 2.d8S#
      • 2.d8B#
      • 2.d8R#
    • 1...Rxe8
      • 2.dxe8Q#
      • 2.dxe8B#
    • 1...Bd4
      • 2.cxd8S#
    • 1...Bc5
      • 2.cxd8S#
    • 1...Ba7
      • 2.cxd8S#
    • 1...Sf6
      • 2.exd8S#
  • Tries
    • 1.Rxb6+?
      • 1...Sxb6
        • 2.cxd8S#
      • 1...Kxb6!
  • Keys
    • 1.d4!
      • threat
        • 2.d5#
      • 1...Rxb8
        • 2.d8S#
      • 1...Rxe8
        • 2.dxe8Q#
        • 2.dxe8B#
      • 1...Bxd4
        • 2.cxd8S#
      • 1...Sxc7
        • 2.Sexd8#
      • 1...exd4
        • 2.Sfxd8#
      • 1...Sf6
        • 2.exd8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 11
  • Sets
    • Q(d);N_GUARD::PXR(k)=S
    • Q(d);N_GUARD,XB(A)::PXR(k)=S
    • R(k);OGATE,XR(J)::P=S
    • R(k);OGATE,XB(K)::PXR(k)=Q
    • B(h);N_GUARD::PXR(k)=S
    • S(c);S_CUTQ(d)::PXR(k)=S
  • Tries
    • Try
      • R(J);CHECK,XB(h)
      • Vars
        • S(j);N_GUARD,SBLOCK,XR(J)::PXR(k)=S
      • Refutation
        • K(i);P-FLIGHT,XR(J)
  • Actual
    • P(C);
    • Threat
      • P(C)
    • Vars
      • R(k);OGATE,XR(J)::P=S
      • R(k);OGATE,XB(K)::PXR(k)=Q
      • B(h);N_GUARD,XP(C)::PXR(k)=S
      • S(j);SBLOCK,XP(F)::S(E),XR(k)
      • P(f);XP(C)::S(I),XR(k)
      • S(c);S_CUTQ(d)::PXR(k)=S
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