MESON Chess Problem Database

Problem Display
PID: 39093 (8/3p2Qb/1KpB4/7R/2k2qRr/2p1rB2/2pPN3/b1N5 w - - 0 1)

Morse, Christopher Jeremy

The Observer, 1964

8/3p2Qb/1KpB4/7R/2k2qRr/2p1rB2/2pPN3/b1N5

#2

9 + 10

136 Problem Observer 2001

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4+
      • 2.Qxd4#
    • 1...Qe4
      • 2.Qf7#
    • 1...Rxf3
      • 2.Qf7#
    • 1...Re4
      • 2.d3#
    • 1...Be4
      • 2.Qd4#
  • Tries
    • 1.Rxf4+?
      • 1...Re4
        • 2.Qf7#
        • 2.d3#
      • 1...Be4
        • 2.Qd4#
        • 2.Qf7#
        • 2.Qg8#
      • 1...Rxf4!
  • Keys
    • 1.Ra5!
      • threat
        • 2.Ra4#
      • 1...Qd4+
        • 2.Qxd4#
      • 1...Rxf3
        • 2.Qf7#
      • 1...Qe4
        • 2.Qf7#
      • 1...Re4
        • 2.d3#
      • 1...Be4
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • Q(f);CHECK,N_GUARD::QAR1(I),XQ(f)
    • Q(f);S_CUTR(d)::QAB(I)
    • R(d);N_GUARD,XB(D)::QAB(I)
    • R(d);N_GUARD,N_SPINQ(f),S_CUTB(j)::P(B)
    • B(j);N_SPINQ(f),S_CUTQ(f)::QAR1(I)
  • Tries
    • Try
      • R(E);CHECK,XQ(f)
      • Refutation
        • R(g);XR(E)
  • Actual
    • R(F);
    • Threat
      • R(F)
    • Vars
      • Q(f);CHECK,N_GUARD::QAR1(I),XQ(f)
      • R(d);N_GUARD,XB(D)::QAB(I)
      • Q(f);S_CUTR(d)::QAB(I)
      • R(d);N_GUARD,N_SPINQ(f),S_CUTB(j)::P(B)
      • B(j);N_SPINQ(f),S_CUTQ(f)::QAR1(I)
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