MESON Chess Problem Database

Problem Display
PID: 210405 (1Q2b3/2ppP3/p4R2/2k2NNR/1np5/n2pP3/8/5K1B w - - 0 1)

Braithwaite, Kenneth Holmes

The Problemist, 1985

1Q2b3/2ppP3/p4R2/2k2NNR/1np5/n2pP3/8/5K1B

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sd5
      • 2.Se4#
    • 1...d6
      • 2.Se6#
  • Tries
    • 1.Sd4?
      • threat
        • 2.Se4#
        • 2.Qa7#
      • 1...Bxh5
        • 2.Qa7#
      • 1...Sb5
        • 2.Se4#
      • 1...Sa2
        • 2.Se4#
      • 1...Sbc2
        • 2.Se4#
      • 1...Sd5
        • 2.Se4#
      • 1...Sc6
        • 2.Se4#
      • 1...c3!
    • 1.Rc6+?
      • 1...dxc6
        • 2.Se6#
      • 1...Sxc6!
  • Keys
    • 1.Sd6!
      • threat
        • 2.Qa7#
      • 1...cxd6
        • 2.Se6#
      • 1...Sd5
        • 2.Sde4#
      • 1...Sb5
        • 2.Sb7#
      • 1...Sa2
        • 2.Sgf7#
      • 1...Sbc2
        • 2.Sgf7#
      • 1...Sc6
        • 2.Sge4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • S(c);SBLOCK::S(E)
    • P(h);N_GUARD::S(E)
  • Tries
    • Try
      • S(D);
      • Threat
        • DUALS(2)
      • Vars
        • B(i);XR(F)::QAB(I)
        • S(a);::R(F)+S(E),DCHECK
        • S(c);::R(F)+S(E),DCHECK
        • S(c);::S(E)
      • Refutation
        • P(d);
    • Try
      • R(G);CHECK
      • Vars
        • P(h);XR(G)::S(E)
      • Refutation
        • S(c);XR(G)
  • Actual
    • S(D);
    • Threat
      • QAB(I)
    • Vars
      • P(g);XS(D)::R(F)+S(E),DCHECK
      • S(c);SBLOCK::S(D)
      • S(a);SBLOCK::S(D)
      • S(c);N_GUARD::R(F)+S(E)
      • S(c);SBLOCK::R(F)+S(E),DCHECK
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