MESON Chess Problem Database

Problem Display
PID: 59022 (1N1R4/8/r2n2K1/2Nk1P2/p3RP1b/4B3/qpbPP3/2Q5 w - - 0 1)

Zeldovich, S

Trud (Moscow), 1950

1N1R4/8/r2n2K1/2Nk1P2/p3RP1b/4B3/qpbPP3/2Q5

#2

11 + 8

1099 WCSC 1983
5396 World Chess Solving Championship 1977-1996 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Qc4
      • 2.Re5#
    • 1...Bb1
      • 2.Rd4#
      • 2.Re5#
    • 1...Bd1
      • 2.Rd4#
      • 2.Re5#
    • 1...Bb3
      • 2.Rd4#
      • 2.Re5#
    • 1...Bd3
      • 2.Rd4#
      • 2.Re5#
  • Tries
    • 1.Sd3?
      • threat
        • 2.Rd4#
      • 1...Kxe4
        • 2.Qh1#
      • 1...Qc4
        • 2.Re5#
      • 1...Bf6!
    • 1.Scxa6?
      • threat
        • 2.Rd4#
      • 1...Kxe4
        • 2.Qh1#
      • 1...Bxe4
        • 2.Sb4#
        • 2.Sc7#
        • 2.Qc5#
        • 2.Qc6#
      • 1...Qc4
        • 2.Re5#
      • 1...Bf6!
    • 1.Se6?
      • threat
        • 2.Rd4#
      • 1...Kxe4
        • 2.Qh1#
      • 1...Bxe4
        • 2.Sc7#
        • 2.Qc5#
      • 1...Qc4
        • 2.Re5#
      • 1...Bf6!
    • 1.Sb7?
      • threat
        • 2.Rd4#
      • 1...Kxe4
        • 2.Qh1#
      • 1...Bxe4
        • 2.Qc5#
      • 1...Qc4
        • 2.Re5#
      • 1...Bf6!
    • 1.Qxc2?
      • threat
        • 2.Rd4#
        • 2.Re5#
        • 2.Qd3#
      • 1...b1Q
        • 2.Rd4#
        • 2.Re5#
      • 1...b1B
        • 2.Rd4#
        • 2.Re5#
      • 1...Qb1
        • 2.Rd4#
        • 2.Re5#
        • 2.Qc4#
      • 1...Qb3
        • 2.Rd4#
        • 2.Re5#
      • 1...Qc4
        • 2.Re5#
        • 2.Qxc4#
      • 1...Qa3
        • 2.Rd4#
        • 2.Re5#
        • 2.Qc4#
      • 1...Bf6!
  • Keys
    • 1.Scd7!
      • threat
        • 2.Rd4#
      • 1...Sc4+
        • 2.Sf6#
      • 1...Sxe4+
        • 2.Sb6#
      • 1...Sb5+
        • 2.Sf6#
      • 1...Sxf5+
        • 2.Sf6#
      • 1...Sb7+
        • 2.Sf6#
      • 1...Sf7+
        • 2.Sf6#
      • 1...Sc8+
        • 2.Sf6#
      • 1...Se8+
        • 2.Sf6#
      • 1...Kxe4
        • 2.Qh1#
      • 1...Bxe4
        • 2.Qc5#
      • 1...Bf6
        • 2.Sxf6#
      • 1...Qc4
        • 2.Re5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 11
    • REMOVED MATES = 0
  • Sets
    • Q(a);SBLOCK::R1(E)
  • Tries
    • Try
      • S(G);
      • Threat
        • R1(E)
      • Vars
        • K(f);N_SPINS(h),OGATEB,S_FLIGHT,XR(E)::QAB(A)
        • Q(a);SBLOCK::R1(E)
      • Refutation
        • B(e);
    • Try
      • S(G);XR(g)
      • Threat
        • R1(E)
      • Vars
        • K(f);N_SPINS(h),OGATEB,S_FLIGHT,XR(E)::QAB(A)
        • Q(a);SBLOCK::R1(E)
      • Refutation
        • B(e);
    • Try
      • S(G);
      • Threat
        • R1(E)
      • Vars
        • K(f);N_SPINS(h),OGATEB,S_FLIGHT,XR(E)::QAB(A)
        • Q(a);SBLOCK::R1(E)
      • Refutation
        • B(e);
    • Try
      • S(G);
      • Threat
        • R1(E)
      • Vars
        • K(f);N_SPINS(h),OGATEB,S_FLIGHT,XR(E)::QAB(A)
        • B(c);OGATE,P_PINP(H),SBLOCK,XR(E)::QAR1(A)
        • Q(a);SBLOCK::R1(E)
      • Refutation
        • B(e);
    • Try
      • Q(A);XB(c)
      • Threat
        • DUALS(3)
      • Refutation
        • B(e);
  • Actual
    • S(G);N_PINS(h)
    • Threat
      • R1(E)
    • Vars
      • S(h);CHECK::R(K)+S(G),DCHECK
      • S(h);CHECK,SBLOCK,XR(E)::R(K)+S(G),DCHECK
      • S(h);CHECK,XP(H)::R(K)+S(G),DCHECK
      • K(f);OGATEB,S_FLIGHT,XR(E)::QAB(A)
      • B(c);OGATE,P_PINP(H),SBLOCK,XR(E)::QAR1(A)
      • B(e);N_GUARD::S(G),XB(e)
      • Q(a);SBLOCK::R1(E)
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