MESON Chess Problem Database

Problem Display
PID: 242910 (7n/3p4/3P4/4p2B/R3NkpB/1Q6/3P1n2/5K2 w - - 0 1)

Fothergill, Percival Guy Laugham (PGLF)

The Field, 1902

(First published on Thu Nov 27 1902)

7n/3p4/3P4/4p2B/R3NkpB/1Q6/3P1n2/5K2

#2

8 + 6

15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kf5
      • 2.Sg3#
    • 1...Sg6
      • 2.Qf7#
    • 1...Sf7
      • 2.Qxf7#
    • 1...g3
      • 2.Qf3#
  • Tries
    • 1.Kxf2?
      • 1...Kf5
        • 2.Sg3#
      • 1...Sg6
        • 2.Qf7#
      • 1...Sf7
        • 2.Qxf7#
      • 1...g3+!
    • 1.Sg3+?
      • 1...Se4
        • 2.Rxe4#
        • 2.Qe3#
      • 1...e4!
    • 1.Bxf2?
      • 1...Sg6
        • 2.Qf7#
      • 1...Sf7
        • 2.Qxf7#
      • 1...g3
        • 2.Qf3#
      • 1...Kf5!
    • 1.Bg6?
      • threat
        • 2.Bg3#
        • 2.Bg5#
        • 2.Qe3#
        • 2.Qg3#
      • 1...Sxe4
        • 2.Rxe4#
        • 2.Qe3#
        • 2.Qg3#
      • 1...Sxg6
        • 2.Qf7#
      • 1...g3
        • 2.Qxg3#
      • 1...Sd1
        • 2.Bg3#
        • 2.Bg5#
        • 2.Qg3#
      • 1...Sh1
        • 2.Bg5#
        • 2.Qe3#
      • 1...Sh3
        • 2.Bg3#
        • 2.Qe3#
        • 2.Qg3#
      • 1...Sf7
        • 2.Bg3#
        • 2.Qxf7#
        • 2.Qe3#
        • 2.Qg3#
      • 1...Sd3!
    • 1.Qe6?
      • threat
        • 2.Qf6#
      • 1...Kf3
        • 2.Sg5#
        • 2.Qf5#
        • 2.Qf6#
      • 1...dxe6!
    • 1.Qf3+?
      • 1...Kxf3
        • 2.Sg5#
      • 1...gxf3!
  • Keys
    • 1.Qg8!
      • 1...Kf3
        • 2.Sg5#
      • 1...Kf5
        • 2.Sg3#
      • 1...Sxe4
        • 2.Qxg4#
      • 1...Sd1
        • 2.Qxg4#
      • 1...Sh1
        • 2.Qxg4#
      • 1...Sd3
        • 2.Qxg4#
      • 1...Sh3
        • 2.Qxg4#
      • 1...Sg6
        • 2.Qf7#
      • 1...Sf7
        • 2.Qxf7#
      • 1...g3
        • 2.Qg5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::S(E)
    • S(f);N_GUARD::QAR(C)
    • S(f);N_GUARD::QAR(C),XS(f)
    • P(c);N_GUARD::QAR1(C)
  • Tries
    • Try
      • K(A);P-FLIGHT,XS(a)
      • Vars
        • K(b);P-FLIGHT::S(E)
        • S(f);N_GUARD::QAR(C)
        • S(f);N_GUARD::QAR(C),XS(f)
      • Refutation
        • P(c);CHECK
    • Try
      • S(E);CHECK
      • Refutation
        • P(d);P_SPINP(d)
    • Try
      • B(F);XS(a)
      • Vars
        • S(f);N_GUARD::QAR(C)
        • S(f);N_GUARD::QAR(C),XS(f)
        • P(c);N_GUARD::QAR1(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • B(G);
      • Threat
        • DUALS(4)
      • Vars
        • S(f);N_GUARD,XB(G)::QAR(C)
        • P(c);::QAB1(C),XP(c)
      • Refutation
        • S(a);
    • Try
      • Q(C);
      • Threat
        • QAR2(C)
      • Refutation
        • P(e);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT,P_SPINP(c),XQ(C)::S(E)
      • Refutation
        • P(c);XQ(C)
  • Actual
    • Q(C);
    • Vars
      • K(b);P-FLIGHT,P_SPINP(c)::S(E)
      • K(b);P-FLIGHT::S(E)
      • S(a);N_GUARD,P_SPINS(a),XS(E)::QAR1(C),XP(c)
      • S(a);N_GUARD::QAR1(C),XP(c)
      • S(f);N_GUARD::QAR(C)
      • S(f);N_GUARD::QAR(C),XS(f)
      • P(c);::QAB1(C)
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