MESON Chess Problem Database

Problem Display
PID: 224539 (8/8/6QB/2p2R1B/8/2pk1N2/K7/N7 w - - 0 1)

Keeble, John Frederick

English Mechanic and World of Science, 1887

(First published on Fri Apr 15 1887)

8/8/6QB/2p2R1B/8/2pk1N2/K7/N7

#2

7 + 3

6490 yacpdb 2020
15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Rxc5#
      • 2.Re5#
    • 1...c4
      • 2.Re5#
  • Tries
    • 1.Se1+?
      • 1...Kd4
        • 2.Qg4#
      • 1...Ke4
        • 2.Qg4#
      • 1...Kc4!
    • 1.Rd5+?
      • 1...Ke2
        • 2.Qg2#
      • 1...Kc4!
    • 1.Qg2?
      • 1...Ke4
        • 2.Qc2#
      • 1...c2
        • 2.Qxc2#
      • 1...c4
        • 2.Qc2#
      • 1...Kc4!
    • 1.Qa6+?
      • 1...Ke4
        • 2.Re5#
      • 1...c4!
    • 1.Qe6?
      • 1...c4
        • 2.Rd5#
        • 2.Qe3#
      • 1...c2!
  • Keys
    • 1.Sc2!
      • 1...Kxc2
        • 2.Se1#
        • 2.Rd5#
      • 1...Ke2
        • 2.Sfe1#
        • 2.Se5#
      • 1...Kc4
        • 2.Qa6#
      • 1...Ke4
        • 2.Rxc5#
        • 2.Re5#
      • 1...c4
        • 2.Re5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(c);SBLOCK::QAB(F)+R(D)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR(F)
        • K(b);S_FLIGHT::QAR2(F)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • R(D);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR2(F)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(F);
      • Vars
        • K(b);S_FLIGHT::QAB(F)
        • P(a);::QAB1(F),XP(a)
        • P(c);SBLOCK::QAB1(F)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(F);CHECK
      • Vars
        • K(b);S_FLIGHT::R1(D)
      • Refutation
        • P(c);P_SPINP(c)
    • Try
      • Q(F);
      • Refutation
        • P(a);
  • Actual
    • S(A);
    • Vars
      • K(b);S_FLIGHT::QAB(F)
      • P(c);SBLOCK::QAB(F)+R(D)
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