MESON Chess Problem Database

Problem Display
PID: 81518 (8/1Q6/B3p3/3nPp2/2n2p2/2Bk1p2/2RP1P2/2K1R3 w - - 0 1)

Macleod, Norman Alasdair

2nd Prize, Problem Observer, 1983

8/1Q6/B3p3/3nPp2/2n2p2/2Bk1p2/2RP1P2/2K1R3

#2

9 + 7

6455 The Chessboard Adventures of Norman Macleod 1996
133 The Problemist Supplement 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sb4
      • 2.Qxf3#
    • 1...Sb6
      • 2.Qxf3#
    • 1...Sf6
      • 2.Qxf3#
    • 1...Sc7
      • 2.Qxf3#
    • 1...Se7
      • 2.Qxf3#
  • Tries
    • 1.Qc6?
      • threat
        • 2.Bxc4#
        • 2.Qxc4#
      • 1...Sxc3
        • 2.Qxc4#
      • 1...Sb6
        • 2.Qxf3#
      • 1...Se3!
    • 1.Qb3?
      • threat
        • 2.Bxc4#
        • 2.Qxc4#
      • 1...Sxc3
        • 2.Qxc4#
        • 2.Qxc3#
      • 1...Sb6
        • 2.Ba1#
        • 2.Bb2#
      • 1...Se3!
    • 1.Qb6?
      • threat
        • 2.Qd4#
      • 1...Sxc3
        • 2.Rxc3#
      • 1...Sxb6!
    • 1.Qa7?
      • threat
        • 2.Qd4#
      • 1...Sxc3
        • 2.Rxc3#
      • 1...Sb6!
  • Keys
    • 1.Rd1!
      • 1...Ke2
        • 2.d4#
      • 1...Ke4
        • 2.d3#
      • 1...Sxc3
        • 2.dxc3#
      • 1...Se3
        • 2.dxe3#
      • 1...Sb4
        • 2.Qxf3#
      • 1...Sb6
        • 2.Qxf3#
      • 1...Sf6
        • 2.Qxf3#
      • 1...Sc7
        • 2.Qxf3#
      • 1...Se7
        • 2.Qxf3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(e);OGATE::QAR2(I),XP(b)
  • Tries
    • Try
      • Q(I);
      • Threat
        • DUALS(2)
      • Vars
        • S(e);XB(F)::QAB1(I),XS(c)
        • S(e);OGATE::QAR2(I),XP(b)
      • Refutation
        • S(e);
    • Try
      • Q(I);
      • Threat
        • DUALS(2)
      • Refutation
        • S(e);
    • Try
      • Q(I);
      • Threat
        • QAR1(I)
      • Vars
        • S(e);OGATE,XB(F)::R1(C),XS(e)
      • Refutation
        • S(e);XQ(I)
    • Try
      • Q(I);
      • Threat
        • QAR1(I)
      • Vars
        • S(e);OGATE,XB(F)::R1(C),XS(e)
      • Refutation
        • S(e);
  • Actual
    • R(B);
    • Vars
      • K(a);OGATE,S_FLIGHT::R(C)+P(D)
      • K(a);N_SPINS(c),OGATE,P_SPINS(e),S_FLIGHT::P(D)
      • S(e);OGATE,XB(F)::R(B)+P(D),XS(e)
      • S(e);OGATE::R(B)+P(D),XS(e)
      • S(e);OGATE::QAR2(I),XP(b)
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