MESON Chess Problem Database

Problem Display
PID: 258567 (8/1Q6/p7/r2N4/2kp1K2/2P5/2B5/8 w - - 0 1)

Challenger, Alfred Clement

English Mechanic and World of Science, 1894

(First published on Fri Dec 14 1894)

8/1Q6/p7/r2N4/2kp1K2/2P5/2B5/8

#2

5 + 4

15239 Valois Notebooks 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qc6#
    • 1...Ra2
      • 2.Qc6#
    • 1...Ra3
      • 2.Qc6#
    • 1...Ra4
      • 2.Qc6#
    • 1...Rc5
      • 2.Qb3#
    • 1...Rxd5
      • 2.Qb4#
  • Tries
    • 1.Bb3+?
      • 1...Kc5
        • 2.Qb6#
      • 1...Kd3!
    • 1.Qc7+?
      • 1...Kb5
        • 2.c4#
      • 1...Kxd5
        • 2.Bb3#
      • 1...Rc5!
  • Keys
    • 1.Qb6!
      • 1...Kxd5
        • 2.Bb3#
      • 1...Rxd5
        • 2.Qb4#
      • 1...dxc3
        • 2.Se3#
      • 1...Rc5
        • 2.Qb3#
      • 1...Ra1
        • 2.Qc6#
      • 1...Ra2
        • 2.Qc6#
      • 1...Ra3
        • 2.Qc6#
      • 1...Ra4
        • 2.Qc6#
      • 1...Rb5
        • 2.Qxd4#
      • 1...d3
        • 2.Bb3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(c);N_GUARD::QAR2(E)
    • R(c);SBLOCK::QAB1(E)
    • R(c);SBLOCK,XS(D)::QAR1(E)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • K(a);N_GUARD,P-FLIGHT::QAB1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::P(B)
        • K(a);N_GUARD,S_FLIGHT,XS(D)::B(A)
      • Refutation
        • R(c);P_SPINR(c)
  • Actual
    • Q(E);
    • Vars
      • K(a);N_GUARD,S_FLIGHT,XS(D)::B(A)
      • R(c);SBLOCK,XS(D)::QAR1(E)
      • P(b);N_GUARD,SBLOCK,XP(B)::S(D)
      • R(c);SBLOCK::QAB1(E)
      • R(c);N_GUARD::QAR2(E)
      • R(c);SBLOCK::QAR1(E),XP(b)
      • P(b);SBLOCK::B(A)
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