MESON Chess Problem Database

Problem Display
PID: 156497 (R3Nnnb/4k1P1/4b3/3P4/7R/8/3K4/4Q3 w - - 0 1)

Packer, GFH

Grantham Journal, 1926

(First published on Sat Nov 6 1926)

R3Nnnb/4k1P1/4b3/3P4/7R/8/3K4/4Q3

#2

7 + 5

5454 Near Snap 2016
15351 SCPF/BCPS Black Books 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Sg6
      • 2.Qxe6#
    • 1...Sd7
      • 2.Qxe6#
    • 1...Sh7
      • 2.Qxe6#
  • Tries
    • 1.d6+?
      • 1...Kf7
        • 2.gxh8S#
      • 1...Kd7!
    • 1.gxf8Q+?
      • 1...Kd7
        • 2.Qd6#
        • 2.Qxe6#
      • 1...Kxf8!
  • Keys
    • 1.Rh7!
      • 1...Kd7
        • 2.gxf8S#
      • 1...Kf7
        • 2.gxh8S#
      • 1...Bxg7
        • 2.Rxg7#
      • 1...Sxh7
        • 2.Qxe6#
      • 1...Sg6
        • 2.Qxe6#
      • 1...Sd7
        • 2.Qxe6#
      • 1...Sf6
        • 2.g8S#
      • 1...Sh6
        • 2.g8S#

Anticipated by 50710(1907)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD::QAR1(A),XB(a)
  • Tries
    • Try
      • P(D);CHECK
      • Vars
        • K(b);N_SPINB(a),P-FLIGHT::PXB(e)=S
      • Refutation
        • K(b);N_SPINB(a),P-FLIGHT
    • Try
      • P(E);CHECK,XS(c)
      • Refutation
        • K(b);N_SPINB(a),S_FLIGHT,XQ(E)
  • Actual
    • R(C);
    • Vars
      • K(b);N_SPINB(a),P-FLIGHT::PXS(c)=S
      • K(b);N_SPINB(a),P-FLIGHT::PXB(e)=S
      • B(e);OGATE,XP(E)::R(C),XB(e)
      • S(c);N_GUARD,XR(C)::QAR1(A),XB(a)
      • S(c);N_GUARD::QAR1(A),XB(a)
      • S(d);OGATE::P=S
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