MESON Chess Problem Database

Problem Display
PID: 145259 (8/2p2p1K/2R5/NB1k1N1R/2q2n2/8/bp6/B3Q3 w - - 0 1)

Byas, Walter

The Observer, 1933

8/2p2p1K/2R5/NB1k1N1R/2q2n2/8/bp6/B3Q3

#2

8 + 7

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Se7#
    • 1...Bb1
      • 2.Bxc4#
    • 1...b1Q
      • 2.Qe5#
    • 1...b1S
      • 2.Se7#
      • 2.Qe5#
    • 1...b1B
      • 2.Qe5#
    • 1...b1R
      • 2.Se7#
      • 2.Qe5#
  • Keys
    • 1.Qe3!
      • threat
        • 2.Se7#
      • 1...Qxc6
        • 2.Bxc6#
      • 1...Qe4
        • 2.Qc5#
      • 1...b1Q
        • 2.Qe5#
      • 1...b1B
        • 2.Qe5#
      • 1...Qd3
        • 2.Rc5#
      • 1...Qc2
        • 2.Qd4#
      • 1...Bb1
        • 2.Bxc4#

This is a version

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(c);SBLOCK::R(F)+S(E),DCHECK
    • B(a);N_GUARD,P_PINS(E)::B(D),XQ(c)
    • P(b);P_PINS(E)::QAR1(B)
  • Actual
    • Q(B);
    • Threat
      • R(F)+S(E),DCHECK
    • Vars
      • Q(c);OGATE,XR(G)::B(D),XQ(c)
      • Q(c);N_GUARD,P_PINS(E),SBLOCK::QAR1(B)
      • P(b);P_PINS(E)::QAR1(B)
      • Q(c);N_GUARD,P_PINS(E)::R1(G)
      • Q(c);N_GUARD,P_PINS(E)::QAR1(B)
      • B(a);N_GUARD,P_PINS(E)::B(D),XQ(c)
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