MESON Chess Problem Database

Problem Display
PID: 134903 (2K4B/2QR1Pr1/3p4/RNNk1PP1/1n2n1P1/1P2pq2/8/3r3B w - - 0 1)

Shanshin, Valery Yurevich

The Problemist, 2009

2K4B/2QR1Pr1/3p4/RNNk1PP1/1n2n1P1/1P2pq2/8/3r3B

#2

13 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qe2
      • 2.Qxd6#
    • 1...Qxg4
      • 2.Qxd6#
    • 1...Qf1
      • 2.Qxd6#
    • 1...Qf2
      • 2.Qxd6#
    • 1...Qh3
      • 2.Qxd6#
    • 1...Qxf5
      • 2.Qxd6#
    • 1...Rg8+
      • 2.fxg8Q#
      • 2.fxg8B#
    • 1...Sd2
      • 2.Qxd6#
    • 1...Sf2
      • 2.Qxd6#
    • 1...Sc3
      • 2.Qxd6#
    • 1...Sg3
      • 2.Qxd6#
    • 1...Sxg5
      • 2.Qxd6#
    • 1...Sf6
      • 2.Qxd6#
  • Tries
    • 1.Bxf3?
      • threat
        • 2.Qxd6#
      • 1...Rg8+
        • 2.fxg8Q#
        • 2.fxg8B#
      • 1...Rg6
        • 2.Sc3#
        • 2.Bxe4#
      • 1...Ke5!
    • 1.Rxd6+?
      • 1...Sxd6+
        • 2.Qxd6#
      • 1...Ke5!
  • Keys
    • 1.Sxd6!
      • threat
        • 2.Sdxe4#
      • 1...Rg8+
        • 2.fxg8Q#
        • 2.fxg8B#
      • 1...Sxd6+
        • 2.Qxd6#
      • 1...Kd4
        • 2.Sb5#
      • 1...Ke5
        • 2.Sc4#
      • 1...Qxf5
        • 2.Sxf5#
      • 1...Rxf7
        • 2.Scxe4#
      • 1...Sxc5
        • 2.Qxc5#
      • 1...Sxg5
        • 2.Se6#
        • 2.Sc4#
        • 2.Sde4#
        • 2.Sb5#
        • 2.Sdb7#
        • 2.Se8#
      • 1...Qg3
        • 2.Se6#
      • 1...Qf4
        • 2.Se6#
      • 1...Rg6
        • 2.Scxe4#
      • 1...Sd2
        • 2.Se6#
        • 2.Sc4#
        • 2.Sde4#
        • 2.Sb5#
        • 2.Sdb7#
        • 2.Se8#
      • 1...Sf2
        • 2.Se6#
        • 2.Sc4#
        • 2.Sde4#
        • 2.Sb5#
        • 2.Sdb7#
        • 2.Se8#
      • 1...Sc3
        • 2.Sc4#
        • 2.Sde4#
        • 2.Sb5#
        • 2.Sdb7#
        • 2.Se8#
      • 1...Sg3
        • 2.Se6#
        • 2.Sc4#
        • 2.Sde4#
        • 2.Sb5#
        • 2.Sdb7#
        • 2.Se8#
      • 1...Sf6
        • 2.Se6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 8
    • REMOVED MATES = 10
  • Sets
    • Q(c);P_SPINS(e)::QAR1(I),XP(g)
    • Q(c);P_SPINS(e),XP(C)::QAR1(I),XP(g)
    • Q(c);P_PINR(J),P_SPINS(e),XP(G)::QAR1(I),XP(g)
    • R(h);CHECK,OGATE::PXR(h)=Q
    • S(e);N_GUARD,P_SPINQ(c)::QAR1(I),XP(g)
    • S(e);N_GUARD,P_SPINQ(c),XP(H)::QAR1(I),XP(g)
  • Tries
    • Try
      • B(A);P_PINS(e),XQ(c)
      • Threat
        • QAR1(I),XP(g)
      • Vars
        • R(h);CHECK,OGATE::PXR(h)=Q
      • Refutation
        • K(f);N_SPINS(e),P-FLIGHT,P_SPINR(h)
    • Try
      • R(J);CHECK,XP(g)
      • Vars
        • S(e);CHECK,OGATE,P_SPINQ(c),XR(J)::QAR1(I),XS(e)
      • Refutation
        • K(f);P-FLIGHT,P_SPINR(h)
  • Actual
    • S(E);XP(g)
    • Threat
      • R(J)+S(E),XS(e)
    • Vars
      • R(h);CHECK,OGATE::PXR(h)=Q
      • S(e);CHECK,OGATE,P_SPINQ(c),P_SPINS(e),XS(E)::QAR1(I),XS(e)
      • K(f);P-FLIGHT,P_SPINR(h)::R(J)+S(E),DCHECK
      • K(f);P-FLIGHT,P_SPINR(h)::QAB(I)+S(E),DCHECK
      • Q(c);P_PINR(J),P_SPINS(e),XP(G)::R(J)+S(E),XQ(c)
      • R(h);XP(K)::R(D)+S(F),XS(e)
      • S(e);OGATE,P_SPINQ(c),P_SPINS(e),XS(F)::QAR1(I),XS(e)
      • Q(c);P_SPINS(e)::R(D)+S(F)
      • R(h);::R(D)+S(F),XS(e)
      • S(e);N_GUARD,P_SPINQ(c)::R(D)+S(F)
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