MESON Chess Problem Database

Problem Display
PID: 188018 (3Q4/1p6/q3p3/2k1NnR1/8/P2p3K/B2P4/1R2N3 w - - 0 1)

Bridgwater, Ralph Herbert

The Observer, 1936

(First published on Sun Oct 25 1936)

3Q4/1p6/q3p3/2k1NnR1/8/P2p3K/B2P4/1R2N3

#2

9 + 6

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa3
      • 2.Qb6#
    • 1...Qa4
      • 2.S1xd3#
      • 2.Qb6#
    • 1...Qa5
      • 2.S1xd3#
    • 1...Qb6
      • 2.S1xd3#
      • 2.Qxb6#
    • 1...Qc6
      • 2.S1xd3#
      • 2.S5xd3#
    • 1...Qa7
      • 2.S1xd3#
    • 1...Qa8
      • 2.S1xd3#
      • 2.Qb6#
    • 1...b5
      • 2.S1xd3#
      • 2.Rc1#
  • Tries
    • 1.Qc7+?
      • 1...Kd4
        • 2.Rg4#
      • 1...Qc6!
  • Keys
    • 1.Sf7!
      • 1...Kc6
        • 2.Qc8#
      • 1...Qxa3
        • 2.Qb6#
        • 2.Qd6#
      • 1...Qd6
        • 2.Qxd6#
      • 1...Qc4
        • 2.Qd6#
      • 1...Qb5
        • 2.Qd6#
      • 1...Qa4
        • 2.Qb6#
        • 2.Qd6#
      • 1...Qa5
        • 2.Qd6#
      • 1...Qb6
        • 2.Qxb6#
      • 1...Qc6
        • 2.Sxd3#
      • 1...Qa7
        • 2.Qd6#
      • 1...Qa8
        • 2.Qb6#
        • 2.Qd6#
      • 1...e5
        • 2.Qd5#
      • 1...b5
        • 2.Rc1#
      • 1...b6
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 9
    • REMOVED MATES = 1
  • Sets
    • Q(d);N_GUARD,XP(E)::QAB1(I)
    • Q(d);N_GUARD::S(B),XP(a)
  • Tries
    • Try
      • Q(I);CHECK
      • Vars
        • K(b);S_FLIGHT::R(H)
      • Refutation
        • Q(d);P_SPINQ(d)
  • Actual
    • S(G);P_PINS(c)
    • Vars
      • K(b);N_SPINS(c),P-FLIGHT::QAR2(I)
      • Q(d);N_GUARD::QAB1(I),XQ(d)
      • Q(d);N_GUARD::QAB1(I)
      • Q(d);N_GUARD,SBLOCK::S(B),XP(a)
      • P(e);N_GUARD,N_SPINS(c)::QAR1(I)
      • P(f);SBLOCK,S_CUTQ(d)::R(A)
      • P(f);S_CUTQ(d)::QAB1(I)
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