MESON Chess Problem Database

Problem Display
PID: 230136 (rbr4n/qbp5/p4p2/6p1/6p1/6Q1/7B/3N1K1k w - - 0 1)

Lawton, Howard

Southend Times, 1938

(First published on Wed Jan 26 1938)

rbr4n/qbp5/p4p2/6p1/6p1/6Q1/7B/3N1K1k

#2

4 + 12

15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qg1+
      • 2.Qxg1#
    • 1...Qf2+
      • 2.Sxf2#
    • 1...Bg2+
      • 2.Qxg2#
    • 1...c5
      • 2.Sf2#
      • 2.Qg1#
    • 1...c6
      • 2.Qg2#
  • Tries
    • 1.Se3?
      • threat
        • 2.Qg1#
      • 1...Bg2+
        • 2.Qxg2#
      • 1...Qxe3!
  • Keys
    • 1.Bg1!
      • threat
        • 2.Qh2#
      • 1...Qxg1+
        • 2.Qxg1#
      • 1...Qf2+
        • 2.Sxf2#
      • 1...Bg2+
        • 2.Qxg2#
      • 1...c5
        • 2.Sf2#
      • 1...c6
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(f);CHECK,N_GUARD::QAR1(D),XQ(f)
    • Q(f);CHECK,N_GUARD::S(A),XQ(f)
    • B(g);CHECK,N_GUARD::QAB1(D),XB(g)
    • P(h);S_CUTB(g)::QAB1(D)
  • Tries
    • Try
      • S(A);
      • Threat
        • QAR1(D)
      • Vars
        • B(g);CHECK,N_GUARD::QAB1(D),XB(g)
      • Refutation
        • Q(f);XS(A)
  • Actual
    • B(C);
    • Threat
      • QAR1(D)
    • Vars
      • Q(f);CHECK,OGATE,XB(C)::QAR1(D),XQ(f)
      • Q(f);CHECK,N_GUARD::S(A),XQ(f)
      • B(g);CHECK,N_GUARD::QAB1(D),XB(g)
      • P(h);S_CUTQ(f)::S(A)
      • P(h);S_CUTB(g)::QAB1(D)
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