MESON Chess Problem Database

Problem Display
PID: 258598 (8/1Q1p4/8/p2p4/2BB3n/5p2/1pK5/4kN2 w - - 0 1)

Fothergill, Percival Guy Laugham (PGLF)

English Mechanic and World of Science, 1898

(First published on Fri Apr 1 1898)

8/1Q1p4/8/p2p4/2BB3n/5p2/1pK5/4kN2

#2

5 + 7

15239 Valois Notebooks 2022

SOLUTION

  • SOUND
  • Sets
    • 1...b1Q+
      • 2.Qxb1#
    • 1...b1S
      • 2.Qxb1#
    • 1...b1B+
      • 2.Qxb1#
    • 1...b1R
      • 2.Qxb1#
    • 1...f2
      • 2.Bc3#
    • 1...a4
      • 2.Qb4#
    • 1...d6
      • 2.Qe7#
  • Tries
    • 1.Qb3?
      • threat
        • 2.Qc3#
        • 2.Qe3#
      • 1...b1Q+
        • 2.Qxb1#
      • 1...b1B+
        • 2.Qxb1#
      • 1...b1S
        • 2.Qxb1#
        • 2.Qe3#
      • 1...Sg2
        • 2.Qc3#
      • 1...Sf5
        • 2.Qc3#
      • 1...dxc4!
    • 1.Qb5?
      • threat
        • 2.Qxa5#
      • 1...b1Q+
        • 2.Qxb1#
      • 1...b1B+
        • 2.Qxb1#
      • 1...b1S
        • 2.Qxb1#
      • 1...b1R
        • 2.Qxb1#
      • 1...a4
        • 2.Qb4#
        • 2.Qa5#
      • 1...dxc4!
    • 1.Qb6?
      • threat
        • 2.Bf2#
        • 2.Bc3#
        • 2.Qxa5#
      • 1...b1Q+
        • 2.Qxb1#
      • 1...b1B+
        • 2.Qxb1#
      • 1...b1S
        • 2.Bf2#
        • 2.Qxb1#
      • 1...b1R
        • 2.Bf2#
        • 2.Bc3#
        • 2.Qxb1#
      • 1...f2
        • 2.Bxf2#
        • 2.Bc3#
        • 2.Qxa5#
      • 1...a4
        • 2.Bf2#
        • 2.Bc3#
        • 2.Qa5#
        • 2.Qb4#
      • 1...dxc4!
  • Keys
    • 1.Sh2!
      • 1...b1Q+
        • 2.Qxb1#
      • 1...b1B+
        • 2.Qxb1#
      • 1...dxc4
        • 2.Qe4#
      • 1...b1S
        • 2.Qxb1#
      • 1...b1R
        • 2.Qxb1#
      • 1...Sg2
        • 2.Sxf3#
      • 1...Sf5
        • 2.Sxf3#
      • 1...Sg6
        • 2.Sxf3#
      • 1...f2
        • 2.Bc3#
      • 1...a4
        • 2.Qb4#
      • 1...d6
        • 2.Qe7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(b);CHECK,OGATE::QAR(E),XQ(b)
    • P(b);OGATE::QAR(E),XS(b)
    • P(b);CHECK,OGATE::QAR(E),XB(b)
    • P(b);OGATE::QAR(E),XR(b)
    • P(c);SBLOCK::B(D)
    • P(e);N_GUARD::QAB(E)
    • P(g);OGATE::QAR(E)
  • Tries
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);CHECK,OGATE::QAR(E),XQ(b)
        • P(b);CHECK,OGATE::QAR(E),XB(b)
        • S(d);::QAB(E)
      • Refutation
        • P(f);XB(C)
    • Try
      • Q(E);
      • Threat
        • QAB(E),XP(e)
      • Vars
        • P(b);CHECK,OGATE::QAR(E),XQ(b)
        • P(b);CHECK,OGATE::QAR(E),XB(b)
        • P(b);OGATE::QAR(E),XS(b)
        • P(b);OGATE::QAR(E),XR(b)
      • Refutation
        • P(f);XB(C)
    • Try
      • Q(E);
      • Threat
        • DUALS(3)
      • Vars
        • P(b);CHECK,OGATE::QAR(E),XQ(b)
        • P(b);CHECK,OGATE::QAR(E),XB(b)
      • Refutation
        • P(f);XB(C)
  • Actual
    • S(A);
    • Vars
      • P(b);CHECK,OGATE::QAR(E),XQ(b)
      • P(b);CHECK,OGATE::QAR(E),XB(b)
      • P(f);OGATE,XB(C)::QAR(E)
      • P(b);OGATE::QAR(E),XS(b)
      • P(b);OGATE::QAR(E),XR(b)
      • S(d);N_GUARD::S(A),XP(c)
      • P(c);SBLOCK::B(D)
      • P(e);N_GUARD::QAB(E)
      • P(g);OGATE::QAR(E)
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