MESON Chess Problem Database

Problem Display
PID: 45298 (3R4/3BNQn1/4b3/2pPn2R/2k1p3/2P5/2K4b/8 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

3R4/3BNQn1/4b3/2pPn2R/2k1p3/2P5/2K4b/8

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd5
      • 2.Qxd5#
    • 1...Sg4
      • 2.Qf1#
    • 1...Sc6
      • 2.Qf1#
    • 1...Sg6
      • 2.Qf1#
    • 1...Sxd7
      • 2.Qf1#
  • Tries
    • 1.Rb8?
      • threat
        • 2.Bb5#
      • 1...Sxd7
        • 2.Qf1#
      • 1...Sc6
        • 2.Qf1#
      • 1...Bxd7!
  • Keys
    • 1.Sc8!
      • threat
        • 2.Sb6#
      • 1...Kxd5
        • 2.Bb5#
      • 1...Bxd7
        • 2.Sd6#
      • 1...Sxd7
        • 2.Qf1#
      • 1...Sc6
        • 2.Qf1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • B(f);OGATE,P_SPINB(f),XP(C)::QAB1(G),XB(f)
    • S(e);N_GUARD::QAB(G)
    • S(e);N_GUARD,XB(E)::QAB(G)
  • Tries
    • Try
      • R(H);
      • Threat
        • B(E)
      • Vars
        • S(e);N_GUARD,XB(E)::QAB(G)
        • S(e);N_GUARD::QAB(G)
      • Refutation
        • B(f);XB(E)
  • Actual
    • S(F);
    • Threat
      • S(F)
    • Vars
      • K(b);P_SPINB(f),P_SPINS(e),S_FLIGHT,XP(C)::R(H)+B(E)
      • B(f);XB(E)::S(F)
      • S(e);N_GUARD,XB(E)::QAB(G)
      • S(e);N_GUARD::QAB(G)
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