MESON Chess Problem Database

Problem Display
PID: 258606 (7Q/8/8/2Pk4/N2nn1K1/1R3B2/PB6/8 w - - 0 1)

Williams, Albert H

English Mechanic and World of Science, 1900

(First published on Fri Jul 20 1900)

7Q/8/8/2Pk4/N2nn1K1/1R3B2/PB6/8

#2

8 + 3

15239 Valois Notebooks 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Qxd4#
    • 1...Sc6
      • 2.Qg8#
  • Tries
    • 1.Bxe4+?
      • 1...Kc4
        • 2.Qxd4#
      • 1...Kxe4
        • 2.Qxd4#
      • 1...Ke6!
    • 1.Rb6?
      • threat
        • 2.Qxd4#
      • 1...Kc4
        • 2.Qxd4#
      • 1...Sxf3
        • 2.Qg8#
      • 1...Sc6
        • 2.Qg8#
      • 1...Sc2
        • 2.Qg8#
      • 1...Se2
        • 2.Qg8#
      • 1...Sb3
        • 2.Qg8#
      • 1...Sb5
        • 2.Qg8#
      • 1...Sf5
        • 2.Qg8#
      • 1...Se6!
    • 1.Qxd4+?
      • 1...Kc6
        • 2.Qd6#
      • 1...Ke6!
    • 1.Qe5+?
      • 1...Kc4
        • 2.Sb6#
        • 2.Qxd4#
      • 1...Kc6
        • 2.Qd6#
      • 1...Kxe5!
  • Keys
    • 1.Qc8!
      • 1...Kc4
        • 2.Sb6#
      • 1...Ke5
        • 2.Qf5#
      • 1...Sxb3
        • 2.Sb6#
      • 1...Sxf3
        • 2.Sb6#
      • 1...Sc2
        • 2.Sb6#
      • 1...Se2
        • 2.Sb6#
      • 1...Sb5
        • 2.Sb6#
      • 1...Sf5
        • 2.Sb6#
      • 1...Sc6
        • 2.Qg8#
      • 1...Se6
        • 2.Sb6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • K(c);N_GUARD,N_SPINS(b),S_FLIGHT::QAR1(H),XS(a)
    • S(a);N_GUARD,SBLOCK::QAB(H)
  • Tries
    • Try
      • B(D);CHECK,XS(b)
      • Vars
        • K(c);N_GUARD,S_FLIGHT::QAR1(H),XS(a)
        • K(c);N_GUARD,S_FLIGHT,XB(D)::QAR1(H),XS(a)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(C);
      • Threat
        • QAR1(H),XS(a)
      • Vars
        • K(c);N_SPINS(b),S_FLIGHT::QAR1(H),XS(a)
        • S(a);N_GUARD,N_SPINS(b),XB(D)::QAB(H)
        • S(a);N_GUARD::QAB(H)
      • Refutation
        • S(a);
    • Try
      • Q(H);CHECK,XS(a)
      • Vars
        • K(c);OGATE,S_FLIGHT::QAR1(H)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT
    • Try
      • Q(H);CHECK
      • Vars
        • K(c);N_GUARD,S_FLIGHT::QAR1(H)
      • Refutation
        • K(c);N_SPINS(b),P-FLIGHT,P_SPINS(a),XQ(H)
  • Actual
    • Q(H);
    • Vars
      • K(c);N_GUARD,N_SPINS(b),S_FLIGHT::S(E)
      • K(c);N_GUARD,N_SPINS(b),P-FLIGHT,P_SPINS(a)::QAR1(H)
      • S(a);XR(C)::S(E)
      • S(a);N_SPINS(b),XB(D)::S(E)
      • S(a);::S(E)
      • S(a);N_GUARD,SBLOCK::QAB(H)
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