MESON Chess Problem Database

Problem Display
PID: 60597 (4n3/R7/r1k3K1/1N3P2/Q7/1p1R4/q4Bb1/2r5 w - - 0 1)

Macleod, Norman Alasdair

British Chess Magazine, 1980

4n3/R7/r1k3K1/1N3P2/Q7/1p1R4/q4Bb1/2r5

#2

7 + 7

6455 The Chessboard Adventures of Norman Macleod 1996
5637 Prague Series Solving Ty. 2002-2003
5405 Chess Solving Yearbook 2003 2004

SOLUTION

  • SOUND
  • Sets
    • 1...Qb1
      • 2.Qxa6#
    • 1...Qb2
      • 2.Qxa6#
    • 1...Qc2
      • 2.Qxa6#
    • 1...Qd2
      • 2.Qxa6#
    • 1...Qe2
      • 2.Qxa6#
    • 1...Ra1
      • 2.Qc4#
    • 1...Rb1
      • 2.Qc4#
    • 1...Rd1
      • 2.Qc4#
    • 1...Re1
      • 2.Qc4#
    • 1...Rf1
      • 2.Qc4#
    • 1...Rg1
      • 2.Qc4#
    • 1...Rh1
      • 2.Qc4#
    • 1...Rc4
      • 2.Qxc4#
    • 1...Sd6
      • 2.Rxd6#
      • 2.Rc7#
    • 1...Sf6
      • 2.Rd6#
      • 2.Rc7#
    • 1...Sc7
      • 2.Rd6#
      • 2.Rxc7#
    • 1...Sg7
      • 2.Rd6#
      • 2.Rc7#
  • Keys
    • 1.Sd4+!
      • 1...Kc5+
        • 2.Se6#
      • 1...Kd5+
        • 2.Sc6#
      • 1...Kb6
        • 2.Sc2#
      • 1...Kd6
        • 2.Sf3#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 13
  • Sets
    • Q(b);N_GUARD::QAR2(C),XR(e)
    • R(a);N_GUARD::QAR2(C)
    • R(a);N_GUARD::QAR2(C),XR(a)
  • Actual
    • S(D);CHECK
    • Vars
      • K(f);CHECK,P-FLIGHT::B(A)+S(D),DCHECK
      • K(f);CHECK,S_FLIGHT::R(B)+S(D)
      • K(f);P-FLIGHT::B(A)+S(D)
      • K(f);P-FLIGHT::R(B)+S(D)
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