MESON Chess Problem Database

Problem Display
PID: 44346 (3B4/5p2/1P3P2/1N2k3/1KP1n2R/7Q/7P/8 w - - 0 1)

Pearson, Arthur Cyril

Lebanon Herald, 0000

3B4/5p2/1P3P2/1N2k3/1KP1n2R/7Q/7P/8

#2

9 + 3

135 The Westminster Papers 1878
3402 Hampstead and Highgate Express 1895
3713 Snap 2007
14867 BCPS Library 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Sxf6
      • 2.Bc7#
  • Tries
    • 1.Rh5+?
      • 1...Kf4
        • 2.Rf5#
      • 1...Sg5!
    • 1.b7?
      • 1...Sxf6
        • 2.Bc7#
        • 2.b8Q#
        • 2.b8B#
      • 1...Sd2
        • 2.b8Q#
        • 2.b8B#
      • 1...Sf2
        • 2.b8Q#
        • 2.b8B#
      • 1...Sc3
        • 2.b8Q#
        • 2.b8B#
      • 1...Sg3
        • 2.b8Q#
        • 2.b8B#
      • 1...Sc5
        • 2.b8Q#
        • 2.b8B#
      • 1...Sg5
        • 2.b8Q#
        • 2.b8B#
      • 1...Sd6!
  • Keys
    • 1.Sd4!
      • 1...Kxd4
        • 2.Qc3#
      • 1...Kd6
        • 2.Bc7#
      • 1...Sxf6
        • 2.Bc7#
        • 2.Qg3#
      • 1...Sd2
        • 2.Qg3#
      • 1...Sf2
        • 2.Qg3#
      • 1...Sc3
        • 2.Qg3#
      • 1...Sg3
        • 2.Qxg3#
      • 1...Sc5
        • 2.Qg3#
      • 1...Sg5
        • 2.Qg3#
      • 1...Sd6
        • 2.Sf3#
        • 2.Sc6#
        • 2.Qg3#

This anticipates 1148(1988)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • S(a);N_GUARD,SBLOCK,XP(H)::B(I)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • K(b);S_FLIGHT::R1(E)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • P(G);
      • Vars
        • S(a);N_GUARD::P=Q
      • Refutation
        • S(a);
  • Actual
    • S(F);
    • Vars
      • K(b);OGATEB,P_SPINS(a),S_FLIGHT,XS(F)::QAB1(B)
      • K(b);S_FLIGHT::B(I)
      • S(a);N_GUARD::QAB(B)
      • S(a);N_GUARD::QAB(B),XS(a)
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