MESON Chess Problem Database

Problem Display
PID: 258568 (2B5/8/2nB4/5P2/3k4/1P1p2NR/6P1/2KQ4 w - - 0 1)

Challenger, Alfred Clement

English Mechanic and World of Science, 1895

(First published on Fri Feb 22 1895)

2B5/8/2nB4/5P2/3k4/1P1p2NR/6P1/2KQ4

#2

9 + 3

15239 Valois Notebooks 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kc3
      • 2.Se2#
    • 1...Ke3
      • 2.Qg1#
    • 1...d2+
      • 2.Qxd2#
  • Tries
    • 1.Se2+?
      • 1...Ke4
        • 2.Qxd3#
      • 1...Kd5!
    • 1.Rh4+?
      • 1...Kc3
        • 2.Rc4#
      • 1...Ke3
        • 2.Qf3#
        • 2.Qe1#
        • 2.Qg1#
        • 2.Qd2#
      • 1...Kd5!
    • 1.Qg4+?
      • 1...Kc3
        • 2.Qc4#
      • 1...Ke3
        • 2.Sh1#
        • 2.Qf4#
      • 1...Kd5!
    • 1.Qe1?
      • 1...d2+
        • 2.Qxd2#
      • 1...Sb4
        • 2.Qe5#
      • 1...Sa5
        • 2.Qe5#
      • 1...Se5
        • 2.Qxe5#
      • 1...Sa7
        • 2.Qe5#
      • 1...Se7
        • 2.Qe5#
      • 1...Sb8
        • 2.Qe5#
      • 1...Sd8
        • 2.Qe5#
      • 1...Kd5!
    • 1.Qg1+?
      • 1...Kd5
        • 2.Qc5#
      • 1...Kc3!
  • Keys
    • 1.Bb7!
      • 1...d2+
        • 2.Qxd2#
      • 1...Kc3
        • 2.Se2#
      • 1...Ke3
        • 2.Qg1#
      • 1...Kd5
        • 2.Qxd3#
      • 1...Sb4
        • 2.Se2#
      • 1...Sa5
        • 2.Se2#
      • 1...Se5
        • 2.Se2#
      • 1...Sa7
        • 2.Se2#
      • 1...Se7
        • 2.Se2#
      • 1...Sb8
        • 2.Se2#
      • 1...Sd8
        • 2.Se2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • K(b);N_GUARD,N_SPINP(a),S_FLIGHT::S(E)
    • K(b);N_GUARD,N_SPINP(a),S_FLIGHT::QAB(B)
    • P(a);CHECK,OGATEB::QAR2(B),XP(a)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(b);N_SPINP(a),P-FLIGHT::QAB1(B),XP(a)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • R(F);CHECK
      • Vars
        • K(b);N_SPINP(a),OGATE,S_FLIGHT::R1(F)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);CHECK,N_PINP(a)
      • Vars
        • K(b);OGATE,S_FLIGHT::QAR1(B)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);N_PINP(a)
      • Vars
        • P(a);CHECK,OGATEB::QAR2(B),XP(a)
        • S(c);N_GUARD::QAB1(B)
        • S(c);N_GUARD::QAB1(B),XS(c)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);CHECK,N_PINP(a)
      • Vars
        • K(b);OGATE,P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • B(I);
    • Vars
      • P(a);CHECK,OGATEB::QAR2(B),XP(a)
      • K(b);N_GUARD,N_SPINP(a),S_FLIGHT::S(E)
      • K(b);N_GUARD,N_SPINP(a),S_FLIGHT::QAB(B)
      • K(b);N_GUARD,P-FLIGHT,P_SPINS(c)::QAR2(B),XP(a)
      • S(c);::S(E)
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