MESON Chess Problem Database

Problem Display
PID: 43368 (1B3N2/2R4N/4PpP1/KR2b1pQ/4bk2/8/5P2/1B6 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

1B3N2/2R4N/4PpP1/KR2b1pQ/4bk2/8/5P2/1B6

#2

11 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Kf5
      • 2.Qf3#
    • 1...Bxg6
      • 2.Sxg6#
    • 1...Ba1
      • 2.Rc3#
    • 1...Bb2
      • 2.Rc3#
    • 1...Bc3+
      • 2.Rxc3#
    • 1...Bxc7+
      • 2.Bxc7#
  • Tries
    • 1.Rc4?
      • 1...Bc7+
        • 2.Bxc7#
      • 1...Kf5
        • 2.Qf3#
      • 1...Bxb8
        • 2.Rxe4#
      • 1...Bd6
        • 2.Bxd6#
        • 2.Rxe4#
      • 1...f5
        • 2.Bxe5#
      • 1...g4!
  • Keys
    • 1.Sxf6!
      • threat
        • 2.Qg4#
      • 1...Bc3+
        • 2.Rxc3#
      • 1...Bxc7+
        • 2.Bxc7#
      • 1...Kf5
        • 2.Qf3#
      • 1...Bxf6
        • 2.Rf7#
      • 1...Bf3
        • 2.Qh2#
      • 1...Bf5
        • 2.Sd5#
      • 1...g4
        • 2.Qxg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • K(b);P-FLIGHT,P_SPINB(a),P_SPINP(d)::QAR2(E)
    • B(a);XP(G)::S(K),XB(a)
    • B(c);OGATEB::B(J)+R(H)
    • B(c);CHECK,OGATEB::B(J)+R(H),XB(c)
    • B(c);CHECK,OGATE,P_SPINB(c),XR(H)::B(J),XB(c)
  • Tries
    • Try
      • R(H);P_PINB(a)
      • Vars
        • B(c);CHECK,OGATEB::B(J),XB(c)
        • K(b);P-FLIGHT,P_SPINP(d)::QAR2(E)
        • B(c);XB(J)::R1(H),XB(a)
        • P(e);N_GUARD,SBLOCK::B(J),XB(c)
      • Refutation
        • P(d);
  • Actual
    • S(I);XP(e)
    • Threat
      • QAR1(E)
    • Vars
      • B(c);CHECK,OGATEB::B(J)+R(H),XB(c)
      • B(c);CHECK,OGATE,P_SPINB(c),XR(H)::B(J),XB(c)
      • K(b);P-FLIGHT,P_SPINB(a),P_SPINP(d)::QAR2(E)
      • B(c);OGATEB,XS(I)::B(J)+R(H)
      • B(a);SBLOCK::QAB(E)
      • B(a);N_GUARD::S(I)
      • P(d);::QAR1(E),XP(d)
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Developed and maintained by Brian Stephenson.
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