MESON Chess Problem Database

Problem Display
PID: 45300 (2N3B1/4p3/n3b3/KP1P1pRp/2kNn2r/1Rp4p/1PP2B2/7Q w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

2N3B1/4p3/n3b3/KP1P1pRp/2kNn2r/1Rp4p/1PP2B2/7Q

#2

12 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2
      • 2.Rxc3#
    • 1...Sg3
      • 2.Rxc3#
    • 1...Sec5
      • 2.Sb6#
      • 2.Rxc3#
    • 1...Sxg5
      • 2.Rxc3#
    • 1...Sd6
      • 2.Rxc3#
    • 1...Sf6
      • 2.Rxc3#
    • 1...Sac5
      • 2.Sb6#
  • Tries
    • 1.Sc6?
      • threat
        • 2.Sb6#
      • 1...Bxc8
        • 2.Se5#
        • 2.Qf1#
      • 1...Sxf2
        • 2.Rxc3#
      • 1...Kxd5!
    • 1.Rxc3+?
      • 1...Kxd5
        • 2.Rxf5#
      • 1...Sxc3!
    • 1.Qf1+?
      • 1...Kxd5
        • 2.Rxf5#
      • 1...Kc5!
  • Keys
    • 1.Sxf5!
      • threat
        • 2.Sb6#
      • 1...Kxd5
        • 2.Sfd6#
      • 1...Bxc8
        • 2.Qf1#
      • 1...Sxf2
        • 2.Rxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • S(d);N_GUARD::R1(E),XP(a)
    • S(d);N_GUARD,XR(J)::R1(E),XP(a)
    • S(h);SBLOCK::S(K)
  • Tries
    • Try
      • S(F);
      • Threat
        • S(K)
      • Vars
        • S(d);N_GUARD,XB(D)::R1(E),XP(a)
      • Refutation
        • K(c);P_SPINB(i),P_SPINP(f),P_SPINS(d),S_FLIGHT,XP(I)
    • Try
      • R(E);CHECK,XP(a)
      • Vars
        • K(c);P_SPINB(i),P_SPINP(f),P_SPINS(d),S_FLIGHT,XP(I)::R(J),XP(f)
      • Refutation
        • S(d);XR(E)
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);P_SPINB(i),P_SPINP(f),S_FLIGHT,XP(I)::R(J),XP(f)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • S(F);XP(f)
    • Threat
      • S(K)
    • Vars
      • K(c);P_SPINB(i),P_SPINS(d),S_FLIGHT,XP(I)::R(J)+S(F)
      • B(i);XS(K)::QAB(A)
      • S(d);N_GUARD,XB(D)::R1(E),XP(a)
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Developed and maintained by Brian Stephenson.
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