MESON Chess Problem Database

Problem Display
PID: 259480 (1rN2K1n/2PP2Q1/2PB1p2/1R1B1k1P/r6q/4pp2/8/8 w - - 0 1)

Cheylan, Yves

Comm., Problemas, 1985

1rN2K1n/2PP2Q1/2PB1p2/1R1B1k1P/r6q/4pp2/8/8

#2

10 + 8

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb5
      • 2.Se7#
    • 1...Rb6
      • 2.Se7#
    • 1...Rb7
      • 2.Se7#
    • 1...Rxc8+
      • 2.dxc8Q#
      • 2.dxc8B#
    • 1...Sg6+
      • 2.Qxg6#
    • 1...Sf7
      • 2.Qg6#
  • Tries
    • 1.Bxf3+?
      • 1...Ke6
        • 2.Qe7#
        • 2.d8S#
      • 1...Rxb5!
    • 1.Be4+?
      • 1...Ke6
        • 2.Bf5#
        • 2.Qe7#
        • 2.d8S#
      • 1...Kxe4!
    • 1.Be6+?
      • 1...Kxe6
        • 2.Qe7#
        • 2.d8S#
      • 1...Ke4!
    • 1.d8Q?
      • threat
        • 2.Se7#
        • 2.Qdd7#
      • 1...Sg6+
        • 2.Qxg6#
      • 1...Rxc8
        • 2.Qxc8#
      • 1...Qg5
        • 2.Qgd7#
        • 2.Qdd7#
      • 1...Qe4
        • 2.Qdxf6#
      • 1...Re4!
  • Keys
    • 1.d8S!
      • threat
        • 2.Se7#
      • 1...Sg6+
        • 2.Qxg6#
      • 1...Rxc8
        • 2.Bxf3#
      • 1...Qg5
        • 2.Qd7#
      • 1...Qe4
        • 2.Be6#
      • 1...Re4
        • 2.Be6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • R(g);N_PINS(I),XR(A)::S(I)
    • R(g);N_PINS(I)::S(I)
    • R(g);CHECK,OGATE,XS(I)::PXR(g)=Q
    • S(h);CHECK,N_GUARD::QAB1(H),XS(h)
    • S(h);N_GUARD::QAB1(H)
  • Tries
    • Try
      • B(B);CHECK,XP(b)
      • Refutation
        • R(g);N_PINS(I),XR(A)
    • Try
      • B(B);CHECK
      • Refutation
        • K(e);S_FLIGHT,XB(B)
    • Try
      • B(B);CHECK
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • P(G);N_SPINS(I)
      • Threat
        • DUALS(2)
      • Vars
        • S(h);CHECK,N_GUARD::QAB1(H),XS(h)
        • R(g);OGATE,P_PINQ(G),XS(I)::QAB(G),XR(g)
        • Q(d);N_GUARD::QAR1(G),XP(f)
      • Refutation
        • R(c);
  • Actual
    • P(G);N_SPINS(I)
    • Threat
      • S(I)
    • Vars
      • S(h);CHECK,N_GUARD::QAB1(H),XS(h)
      • R(g);N_GUARD,P_PINS(G),XS(I)::R(A)+B(B),XP(b)
      • Q(d);SBLOCK::QAB(H)
      • Q(d);SBLOCK::R(A)+B(B),DCHECK
      • R(c);SBLOCK::R(A)+B(B),DCHECK
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