MESON Chess Problem Database

Problem Display
PID: 1148 (4B3/2p5/2P3P1/3k2N1/R2n1PK1/Q7/P7/8 w - - 0 1)

McWilliam, Robert C

Problem Observer, 1988

4B3/2p5/2P3P1/3k2N1/R2n1PK1/Q7/P7/8

#2

9 + 3

3713 Snap 2007
15393 McWilliam Scrapbook 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Sxc6
      • 2.Bf7#
  • Tries
    • 1.Ra5+?
      • 1...Kc4
        • 2.Rc5#
      • 1...Sb5!
    • 1.g7?
      • 1...Sxc6
        • 2.Bf7#
        • 2.g8Q#
        • 2.g8B#
      • 1...Sc2
        • 2.g8Q#
        • 2.g8B#
      • 1...Se2
        • 2.g8Q#
        • 2.g8B#
      • 1...Sb3
        • 2.g8Q#
        • 2.g8B#
      • 1...Sf3
        • 2.g8Q#
        • 2.g8B#
      • 1...Sb5
        • 2.g8Q#
        • 2.g8B#
      • 1...Sf5
        • 2.g8Q#
        • 2.g8B#
      • 1...Se6!
  • Keys
    • 1.Se4!
      • 1...Kxe4
        • 2.Qf3#
      • 1...Ke6
        • 2.Bf7#
      • 1...Sxc6
        • 2.Bf7#
        • 2.Qb3#
      • 1...Sc2
        • 2.Qb3#
      • 1...Se2
        • 2.Qb3#
      • 1...Sb3
        • 2.Qxb3#
      • 1...Sf3
        • 2.Qb3#
      • 1...Sb5
        • 2.Qb3#
      • 1...Sf5
        • 2.Qb3#
      • 1...Se6
        • 2.Sc3#
        • 2.Sf6#
        • 2.Qb3#

Anticipated by 44346(0000)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • S(a);N_GUARD,SBLOCK,XP(G)::B(I)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • K(b);S_FLIGHT::R1(C)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • P(H);
      • Vars
        • S(a);N_GUARD::P=Q
      • Refutation
        • S(a);
  • Actual
    • S(F);
    • Vars
      • K(b);OGATEB,P_SPINS(a),S_FLIGHT,XS(F)::QAB1(B)
      • K(b);S_FLIGHT::B(I)
      • S(a);N_GUARD::QAB(B)
      • S(a);N_GUARD::QAB(B),XS(a)
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