MESON Chess Problem Database

Problem Display
PID: 153663 (8/3N4/8/1p1K4/kp6/bR2Q3/8/8 w - - 0 1)

Harley, Brian

The Observer, 1946

(First published on Sun Jan 6 1946)

8/3N4/8/1p1K4/kp6/bR2Q3/8/8

#2

4 + 4

15290 Harley Scrapbook 2015
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Ka5
      • 2.Qa7#
  • Tries
    • 1.Rd3?
      • threat
        • 2.Qa7#
      • 1...Ka5
        • 2.Qa7#
      • 1...b3!
    • 1.Qd4?
      • 1...Ka5
        • 2.Qa7#
      • 1...Bc1
        • 2.Qxb4#
      • 1...Bb2
        • 2.Qxb4#
      • 1...Kxb3!
    • 1.Qc5?
      • 1...Ka5
        • 2.Qa7#
      • 1...Bc1
        • 2.Qxb4#
      • 1...Bb2
        • 2.Qxb4#
      • 1...Kxb3!
    • 1.Qe1?
      • 1...Ka5
        • 2.Rxa3#
      • 1...Bc1
        • 2.Qxb4#
      • 1...Bb2
        • 2.Qxb4#
      • 1...Kxb3!
    • 1.Qc3?
      • 1...Ka5
        • 2.Rxa3#
      • 1...Bc1
        • 2.Qxb4#
      • 1...Bb2
        • 2.Qxb4#
      • 1...bxc3!
  • Keys
    • 1.Qd2!
      • 1...Kxb3
        • 2.Sc5#
      • 1...Ka5
        • 2.Rxa3#
      • 1...Bc1
        • 2.Qxb4#
      • 1...Bb2
        • 2.Qxb4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::QAR2(B)
  • Tries
    • Try
      • R(A);
      • Threat
        • QAR(B)
      • Vars
        • K(b);P-FLIGHT::QAR2(B)
      • Refutation
        • P(c);
    • Try
      • Q(B);P_PINP(c)
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT::QAR2(B)
        • B(a);N_GUARD::QAR1(B),XP(c)
      • Refutation
        • K(b);N_SPINP(c),S_FLIGHT,XR(A)
    • Try
      • Q(B);
      • Vars
        • K(b);P-FLIGHT,P_SPINP(d)::QAR2(B)
        • B(a);N_GUARD::QAR1(B),XP(c)
      • Refutation
        • K(b);S_FLIGHT,XR(A)
    • Try
      • Q(B);
      • Vars
        • K(b);P-FLIGHT,P_SPINP(c)::R(A),XB(a)
        • B(a);N_GUARD::QAR1(B),XP(c)
      • Refutation
        • K(b);S_FLIGHT,XR(A)
    • Try
      • Q(B);
      • Vars
        • K(b);P-FLIGHT,P_SPINP(c)::R(A),XB(a)
        • B(a);N_GUARD::QAR1(B),XP(c)
      • Refutation
        • P(c);XQ(B)
  • Actual
    • Q(B);
    • Vars
      • K(b);S_FLIGHT,XR(A)::S(D)
      • K(b);P-FLIGHT,P_SPINP(c)::R(A),XB(a)
      • B(a);N_GUARD::QAR1(B),XP(c)
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