MESON Chess Problem Database

Problem Display
PID: 81578 (1n6/8/3NK3/8/1P1kPp2/3p4/1R3R2/7Q w - - 0 1)

Macleod, Norman Alasdair

1st Comm., The Problemist, 1984/II

1n6/8/3NK3/8/1P1kPp2/3p4/1R3R2/7Q

#2

7 + 4

6455 The Chessboard Adventures of Norman Macleod 1996
3713 Snap 2009
5454 Near Snap 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Kc3
      • 2.Qh8#
    • 1...Ke3
      • 2.Sf5#
  • Tries
    • 1.Sb5+?
      • 1...Ke3
        • 2.Qf3#
        • 2.Qe1#
      • 1...Kc4!
    • 1.Sf5+?
      • 1...Kc3
        • 2.Qc1#
      • 1...Kc4!
    • 1.Qg1?
      • threat
        • 2.Rfc2#
      • 1...Kc3
        • 2.Qg7#
      • 1...Ke3
        • 2.Rf1#
      • 1...d2
        • 2.Rf3#
      • 1...f3!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Rbe2#
      • 1...Kc3
        • 2.Rb1#
      • 1...Ke3
        • 2.Qa7#
      • 1...d2
        • 2.Rb3#

Anticipated by 103151(1974), 103291(1974)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::QAB(A)
    • K(b);S_FLIGHT::S(F)
  • Tries
    • Try
      • S(F);CHECK
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR2(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAB(A)+R(C)
      • Vars
        • K(b);S_FLIGHT::QAB(A)
        • K(b);S_FLIGHT::QAB(A)+R(C)
        • P(a);::QAB(A)+R(C)
      • Refutation
        • P(c);
  • Actual
    • Q(A);
    • Threat
      • QAB(A)+R(B)
    • Vars
      • K(b);S_FLIGHT::QAB(A)+R(B)
      • K(b);S_FLIGHT::QAB(A)
      • P(a);::QAB(A)+R(B)
HTML5 logo

Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).