MESON Chess Problem Database

Problem Display
PID: 153798 (8/3K2pk/7p/8/7Q/8/BB6/8 w - - 0 1)

Harley, Brian

The Observer, 1950

(First published on Sun Jan 1 1950)

8/3K2pk/7p/8/7Q/8/BB6/8

#2

4 + 3

15290 Harley Scrapbook 2015
133 The Problemist Supplement 2017
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kh8
      • 2.Qxh6#
    • 1...h5
      • 2.Qxh5#
    • 1...g5
      • 2.Qe4#
    • 1...g6
      • 2.Qe7#
  • Tries
    • 1.Kc6?
      • 1...Kh8
        • 2.Qxh6#
      • 1...h5
        • 2.Qxh5#
      • 1...g5
        • 2.Qe4#
      • 1...g6
        • 2.Qe7#
      • 1...Kg6!
    • 1.Kd6?
      • 1...Kh8
        • 2.Qxh6#
      • 1...h5
        • 2.Qxh5#
      • 1...g5
        • 2.Qe4#
      • 1...g6
        • 2.Qe7#
      • 1...Kg6!
    • 1.Kc7?
      • 1...Kh8
        • 2.Qxh6#
      • 1...h5
        • 2.Qxh5#
      • 1...g5
        • 2.Qe4#
      • 1...g6
        • 2.Qe7#
      • 1...Kg6!
    • 1.Ke7?
      • 1...Kg6
        • 2.Bb1#
      • 1...Kh8
        • 2.Qxh6#
      • 1...h5
        • 2.Qxh5#
      • 1...g5
        • 2.Qe4#
      • 1...g6!
    • 1.Kc8?
      • 1...Kh8
        • 2.Qxh6#
      • 1...h5
        • 2.Qxh5#
      • 1...g5
        • 2.Qe4#
      • 1...g6
        • 2.Qe7#
      • 1...Kg6!
    • 1.Kd8?
      • 1...Kh8
        • 2.Qxh6#
      • 1...h5
        • 2.Qxh5#
      • 1...g5
        • 2.Qe4#
      • 1...g6
        • 2.Qe7#
      • 1...Kg6!
    • 1.Bb3?
      • 1...Kh8
        • 2.Qxh6#
      • 1...h5
        • 2.Qxh5#
      • 1...g6
        • 2.Qe7#
      • 1...g5
        • 2.Qe4#
      • 1...Kg6!
    • 1.Bc4?
      • 1...Kh8
        • 2.Qxh6#
      • 1...h5
        • 2.Qxh5#
      • 1...g6
        • 2.Qe7#
      • 1...g5
        • 2.Qe4#
      • 1...Kg6!
    • 1.Bd5?
      • 1...Kh8
        • 2.Qxh6#
      • 1...h5
        • 2.Qxh5#
      • 1...g6
        • 2.Qe7#
      • 1...g5
        • 2.Qe4#
      • 1...Kg6!
    • 1.Be6?
      • 1...Kh8
        • 2.Qxh6#
      • 1...h5
        • 2.Qxh5#
      • 1...g6
        • 2.Qe7#
      • 1...g5
        • 2.Qe4#
      • 1...Kg6!
    • 1.Bf7?
      • 1...Kh8
        • 2.Qxh6#
      • 1...h5
        • 2.Qxh5#
      • 1...g5
        • 2.Qe4#
      • 1...g6!
    • 1.Ba1?
      • 1...Kh8
        • 2.Qxh6#
      • 1...h5
        • 2.Qxh5#
      • 1...g6
        • 2.Qe7#
      • 1...g5
        • 2.Qe4#
      • 1...Kg6!
    • 1.Bc3?
      • 1...Kh8
        • 2.Qxh6#
      • 1...h5
        • 2.Qxh5#
      • 1...g6
        • 2.Qe7#
      • 1...g5
        • 2.Qe4#
      • 1...Kg6!
    • 1.Bd4?
      • 1...Kh8
        • 2.Qxh6#
      • 1...h5
        • 2.Qxh5#
      • 1...g6
        • 2.Qe7#
      • 1...g5
        • 2.Qe4#
      • 1...Kg6!
    • 1.Be5?
      • 1...Kh8
        • 2.Qxh6#
      • 1...h5
        • 2.Qxh5#
      • 1...g6
        • 2.Qe7#
      • 1...g5
        • 2.Qe4#
      • 1...Kg6!
    • 1.Qg3?
      • threat
        • 2.Qxg7#
      • 1...Kh8
        • 2.Qxg7#
      • 1...g5
        • 2.Qd3#
      • 1...g6!
    • 1.Qg5?
      • threat
        • 2.Qxg7#
      • 1...Kh8
        • 2.Qxh6#
        • 2.Qxg7#
      • 1...g6
        • 2.Qe7#
      • 1...hxg5!
    • 1.Qf6?
      • threat
        • 2.Qxg7#
      • 1...Kh8
        • 2.Qxg7#
        • 2.Qxh6#
      • 1...g6
        • 2.Qe7#
        • 2.Qg7#
        • 2.Qh8#
        • 2.Qf7#
      • 1...g5
        • 2.Qg7#
        • 2.Qf5#
        • 2.Qf7#
      • 1...gxf6!
    • 1.Qe7?
      • threat
        • 2.Qxg7#
      • 1...Kh8
        • 2.Qxg7#
      • 1...Kg6!
    • 1.Qd4?
      • threat
        • 2.Qxg7#
      • 1...Kh8
        • 2.Qxg7#
      • 1...g6
        • 2.Qg7#
        • 2.Qh8#
      • 1...g5
        • 2.Qg7#
        • 2.Qd3#
        • 2.Qe4#
      • 1...Kg6!
    • 1.Qe4+?
      • 1...g6
        • 2.Qe7#
      • 1...Kh8!
    • 1.Qg4?
      • threat
        • 2.Qxg7#
      • 1...Kh8
        • 2.Qxg7#
      • 1...g5
        • 2.Qf5#
        • 2.Qe4#
      • 1...g6!
    • 1.Qh5?
      • 1...Kh8
        • 2.Qxh6#
      • 1...g5
        • 2.Qf7#
      • 1...g6!
  • Keys
    • 1.Ke8!
      • 1...Kg6
        • 2.Bb1#
      • 1...Kh8
        • 2.Qxh6#
      • 1...h5
        • 2.Qxh5#
      • 1...g5
        • 2.Qe4#
      • 1...g6
        • 2.Qe7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(c);P-FLIGHT::QAR2(C),XP(a)
    • P(a);OGATEB::QAR2(C),XP(a)
    • P(b);N_GUARD::QAB(C)
    • P(b);OGATEB,SBLOCK::QAR(C)
  • Tries
    • Try
      • K(D);S_FLIGHT
      • Vars
        • K(c);P-FLIGHT::QAR2(C),XP(a)
        • P(a);OGATEB::QAR2(C),XP(a)
        • P(b);N_GUARD::QAB(C)
        • P(b);OGATEB,SBLOCK::QAR(C)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
    • Try
      • K(D);P-FLIGHT
      • Vars
        • K(c);P-FLIGHT::QAR2(C),XP(a)
        • P(a);OGATEB::QAR2(C),XP(a)
        • P(b);N_GUARD::QAB(C)
        • P(b);OGATEB,SBLOCK::QAR(C)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
    • Try
      • K(D);P-FLIGHT
      • Vars
        • K(c);P-FLIGHT::QAR2(C),XP(a)
        • P(a);OGATEB::QAR2(C),XP(a)
        • P(b);N_GUARD::QAB(C)
        • P(b);OGATEB,SBLOCK::QAR(C)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
    • Try
      • K(D);P-FLIGHT
      • Vars
        • K(c);N_SPINP(a),S_FLIGHT::B(A)
        • K(c);P-FLIGHT::QAR2(C),XP(a)
        • P(a);OGATEB::QAR2(C),XP(a)
        • P(b);N_GUARD::QAB(C)
      • Refutation
        • P(b);
    • Try
      • K(D);S_FLIGHT
      • Vars
        • K(c);P-FLIGHT::QAR2(C),XP(a)
        • P(a);OGATEB::QAR2(C),XP(a)
        • P(b);N_GUARD::QAB(C)
        • P(b);OGATEB,SBLOCK::QAR(C)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
    • Try
      • K(D);P-FLIGHT
      • Vars
        • K(c);P-FLIGHT::QAR2(C),XP(a)
        • P(a);OGATEB::QAR2(C),XP(a)
        • P(b);N_GUARD::QAB(C)
        • P(b);OGATEB,SBLOCK::QAR(C)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
    • Try
      • B(A);
      • Vars
        • K(c);P-FLIGHT::QAR2(C),XP(a)
        • P(a);OGATEB::QAR2(C),XP(a)
        • P(b);OGATEB,SBLOCK::QAR(C)
        • P(b);N_GUARD::QAB(C)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
    • Try
      • B(A);
      • Vars
        • K(c);P-FLIGHT::QAR2(C),XP(a)
        • P(a);OGATEB::QAR2(C),XP(a)
        • P(b);OGATEB,SBLOCK::QAR(C)
        • P(b);N_GUARD::QAB(C)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
    • Try
      • B(A);
      • Vars
        • K(c);P-FLIGHT::QAR2(C),XP(a)
        • P(a);OGATEB::QAR2(C),XP(a)
        • P(b);OGATEB,SBLOCK::QAR(C)
        • P(b);N_GUARD::QAB(C)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
    • Try
      • B(A);
      • Vars
        • K(c);P-FLIGHT::QAR2(C),XP(a)
        • P(a);OGATEB::QAR2(C),XP(a)
        • P(b);OGATEB,SBLOCK::QAR(C)
        • P(b);N_GUARD::QAB(C)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
    • Try
      • B(A);
      • Vars
        • K(c);P-FLIGHT::QAR2(C),XP(a)
        • P(a);OGATEB::QAR2(C),XP(a)
        • P(b);N_GUARD::QAB(C)
      • Refutation
        • P(b);
    • Try
      • B(B);
      • Vars
        • K(c);P-FLIGHT::QAR2(C),XP(a)
        • P(a);OGATEB::QAR2(C),XP(a)
        • P(b);OGATEB,SBLOCK::QAR(C)
        • P(b);N_GUARD::QAB(C)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
    • Try
      • B(B);
      • Vars
        • K(c);P-FLIGHT::QAR2(C),XP(a)
        • P(a);OGATEB::QAR2(C),XP(a)
        • P(b);OGATEB,SBLOCK::QAR(C)
        • P(b);N_GUARD::QAB(C)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
    • Try
      • B(B);
      • Vars
        • K(c);P-FLIGHT::QAR2(C),XP(a)
        • P(a);OGATEB::QAR2(C),XP(a)
        • P(b);OGATEB,SBLOCK::QAR(C)
        • P(b);N_GUARD::QAB(C)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
    • Try
      • B(B);
      • Vars
        • K(c);P-FLIGHT::QAR2(C),XP(a)
        • P(a);OGATEB::QAR2(C),XP(a)
        • P(b);OGATEB,SBLOCK::QAR(C)
        • P(b);N_GUARD::QAB(C)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
    • Try
      • Q(C);N_PINP(a)
      • Threat
        • QAR1(C),XP(b)
      • Vars
        • K(c);P-FLIGHT,P_SPINP(b)::QAB1(C),XP(b)
        • P(b);N_GUARD::QAB(C)
      • Refutation
        • P(b);
    • Try
      • Q(C);N_PINP(a)
      • Threat
        • QAR1(C),XP(b)
      • Vars
        • P(b);OGATEB,SBLOCK::QAR(C)
      • Refutation
        • P(a);XQ(C)
    • Try
      • Q(C);N_PINP(a)
      • Threat
        • QAR1(C),XP(b)
      • Refutation
        • P(b);XQ(C)
    • Try
      • Q(C);N_PINP(a),P_PINP(b)
      • Threat
        • QAR1(C),XP(b)
      • Vars
        • K(c);P-FLIGHT::QAB1(C),XP(b)
      • Refutation
        • K(c);N_SPINP(b),S_FLIGHT
    • Try
      • Q(C);N_PINP(a)
      • Threat
        • QAR1(C),XP(b)
      • Vars
        • K(c);P-FLIGHT,P_SPINP(b)::QAB1(C),XP(b)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(C);CHECK,N_PINP(a)
      • Vars
        • P(b);OGATEB,P_SPINP(b),SBLOCK::QAR(C)
      • Refutation
        • K(c);P-FLIGHT,P_SPINP(b)
    • Try
      • Q(C);N_PINP(a)
      • Threat
        • QAR1(C),XP(b)
      • Vars
        • K(c);P-FLIGHT,P_SPINP(b)::QAB1(C),XP(b)
      • Refutation
        • P(b);
    • Try
      • Q(C);
      • Vars
        • K(c);P-FLIGHT::QAR2(C),XP(a)
        • P(b);OGATEB::QAR2(C)
      • Refutation
        • P(b);
  • Actual
    • K(D);S_FLIGHT
    • Vars
      • K(c);N_SPINP(a),S_FLIGHT::B(A)
      • K(c);P-FLIGHT::QAR2(C),XP(a)
      • P(a);OGATEB::QAR2(C),XP(a)
      • P(b);N_GUARD::QAB(C)
      • P(b);OGATEB,SBLOCK::QAR(C)
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