MESON Chess Problem Database

Problem Display
PID: 169093 (K2k4/Nnp1bPPP/N1B1P3/2nP4/1Q6/8/8/3RRrqr w - - 0 1)

Kapustin, Fedor Mikhailovich

Permyakov, Evgeni Nikolaevich

3rd Place, SuperProblem 012. TT, 2012

K2k4/Nnp1bPPP/N1B1P3/2nP4/1Q6/8/8/3RRrqr

#2

12 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bf6
      • 2.f8Q#
    • 1...Bf8
      • 2.gxf8Q#
    • 1...Sa5
      • 2.Qb8#
  • Tries
    • 1.g8Q+?
      • 1...Bf8
        • 2.Qxf8#
        • 2.e7#
      • 1...Qxg8!
    • 1.g8R+?
      • 1...Bf8
        • 2.e7#
      • 1...Qxg8!
    • 1.h8Q+?
      • 1...Bf8
        • 2.Qxf8#
        • 2.e7#
        • 2.gxf8Q#
      • 1...Rxh8!
    • 1.h8R+?
      • 1...Bf8
        • 2.e7#
        • 2.gxf8Q#
      • 1...Rxh8!
  • Keys
    • 1.d6!
      • threat
        • 2.dxc7#
      • 1...Bxd6
        • 2.e7#
      • 1...Sxa6
        • 2.dxe7#
      • 1...Sxd6
        • 2.Qb8#
      • 1...cxd6
        • 2.Qb6#
      • 1...Bh4
        • 2.h8Q#
        • 2.h8R#
      • 1...Bg5
        • 2.g8Q#
        • 2.g8R#
      • 1...Bf6
        • 2.f8Q#
        • 2.f8R#
      • 1...Bf8
        • 2.gxf8Q#
        • 2.gxf8R#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • B(g);N_GUARD,S_CUTR(a)::P=Q
    • B(g);OGATE::PXB(g)=Q
    • S(e);OGATE::QAR2(C)
  • Tries
    • Try
      • P(J);CHECK
      • Refutation
        • Q(b);XQ(J)
    • Try
      • P(J);CHECK
      • Vars
        • B(g);OGATE,P_SPINB(g)::P(G)
      • Refutation
        • Q(b);XR(J)
    • Try
      • P(K);CHECK
      • Refutation
        • R(c);XQ(K)
    • Try
      • P(K);CHECK
      • Refutation
        • R(c);XR(K)
  • Actual
    • P(D);
    • Threat
      • R(A)+P(D)DCHECK,XP(f)
    • Vars
      • B(g);OGATE,P_SPINB(g),XP(D)::P(G)
      • S(d);XS(E)::R(A)+P(D)DCHECK,XB(g)
      • S(e);OGATE,P_SPINS(e),XP(D)::QAR2(C)
      • P(f);OGATEB,P_SPINP(f),XP(D)::QAB(C)
      • B(g);N_GUARD,S_CUTR(c)::P=Q
      • B(g);N_GUARD,S_CUTQ(b)::P=Q
      • B(g);N_GUARD,S_CUTR(a)::P=Q
      • B(g);OGATE::PXB(g)=Q
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