MESON Chess Problem Database

Problem Display
PID: 143527 (1B3r2/1q5B/1b2N1n1/4NbR1/n1QPk3/3p1p2/5K2/8 w - - 0 1)

Keeney, Palmer Gunkel

American Chess Problemist, 1949

1B3r2/1q5B/1b2N1n1/4NbR1/n1QPk3/3p1p2/5K2/8

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5
      • 2.Qxd3#
    • 1...Qa6
      • 2.Qc6#
    • 1...Qc6
      • 2.Qxc6#
    • 1...Qa7
      • 2.Qc6#
    • 1...Qe7
      • 2.Qc6#
    • 1...Qf7
      • 2.Qc6#
    • 1...Qg7
      • 2.Qc6#
    • 1...Qxh7
      • 2.Qc6#
    • 1...Qxb8
      • 2.Qc6#
    • 1...Bxd4+
      • 2.Qxd4#
    • 1...Ba5
      • 2.d5#
    • 1...Bc5
      • 2.dxc5#
    • 1...Bd8
      • 2.d5#
    • 1...Sc5
      • 2.dxc5#
      • 2.d5#
    • 1...Sh4
      • 2.Rg4#
    • 1...Se7
      • 2.Rg4#
    • 1...Sh8
      • 2.Rg4#
  • Tries
    • 1.Sc5+?
      • 1...Bxc5
        • 2.dxc5#
      • 1...Sxc5
        • 2.dxc5#
        • 2.d5#
      • 1...Kf4!
    • 1.Bxg6?
      • threat
        • 2.Rg4#
      • 1...Bxd4+
        • 2.Qxd4#
      • 1...Bxg6!
    • 1.Rg4+?
      • 1...Sf4
        • 2.Sg5#
        • 2.Rxf4#
      • 1...Bxg4!
  • Keys
    • 1.Sxf3!
      • threat
        • 2.Sd2#
      • 1...Bxd4+
        • 2.Qxd4#
      • 1...Bxe6
        • 2.Qxe6#
      • 1...Bh3
        • 2.Re5#
      • 1...Bg4
        • 2.Re5#
      • 1...Ba5
        • 2.d5#
      • 1...d2
        • 2.Sxd2#

This is a version of 143473

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 14
  • Sets
    • Q(h);SBLOCK::QAB1(B),XP(a)
    • Q(h);N_GUARD::QAB(B)
    • Q(h);N_GUARD::QAB(B),XQ(h)
    • Q(h);N_GUARD,XB(G)::QAB(B)
    • Q(h);N_GUARD,XB(H)::QAB(B)
    • B(f);CHECK,OGATE,P_SPINB(f),XP(C)::QAR1(B),XB(f)
    • B(f);N_PINP(C)::QAR(B)+P(C)
    • B(f);::QAR(B)+P(C),XB(f)
    • S(g);N_GUARD,P_SPINB(e)::R(E)
  • Tries
    • Try
      • S(F);CHECK,N_SPINP(C)
      • Vars
        • B(f);OGATE,P_PINP(C),XS(F)::QAR(B)+P(C),XB(f)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • B(G);P_PINB(e),XS(g)
      • Threat
        • R(E)
      • Vars
        • B(f);CHECK,N_SPINB(e),OGATE,P_SPINB(f),XP(C)::QAR1(B),XB(f)
      • Refutation
        • B(e);N_SPINB(e),XB(G)
    • Try
      • R(E);CHECK
      • Refutation
        • B(e);P_SPINS(g),XR(E)
  • Actual
    • S(D);XP(b)
    • Threat
      • S(D)
    • Vars
      • B(f);CHECK,OGATE,P_SPINB(f),XP(C)::QAR1(B),XB(f)
      • B(e);OGATE,P_PINS(D),P_SPINS(g),XS(F)::QAR2(B),XB(e)
      • B(e);OGATE,P_PINS(D),P_SPINS(g)::R1(E)
      • B(f);N_PINP(C)::QAR(B)+P(C)
      • P(a);::S(D),XP(a)
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