MESON Chess Problem Database

Problem Display
PID: 61630 (1R4N1/2nk2Kn/1PpppPB1/2b1P3/3q3B/3N4/8/3R4 w - - 0 1)

Mernagh, JP

Chess, 1943

1R4N1/2nk2Kn/1PpppPB1/2b1P3/3q3B/3N4/8/3R4

#2

10 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Sxc5#
    • 1...Qb2
      • 2.Sxc5#
    • 1...Qxe5
      • 2.Sxe5#
    • 1...Qa4
      • 2.Sxc5#
    • 1...Qe4
      • 2.Sxc5#
    • 1...Qf4
      • 2.Sxc5#
    • 1...Qg4
      • 2.Sxc5#
    • 1...Qxh4
      • 2.Sxc5#
    • 1...Sb5
      • 2.Be8#
    • 1...Sd5
      • 2.Be8#
    • 1...Sa6
      • 2.Be8#
    • 1...Sa8
      • 2.Be8#
    • 1...Se8+
      • 2.Bxe8#
  • Keys
    • 1.f7!
      • threat
        • 2.Rd8#
      • 1...Qxe5+
        • 2.Sxe5#
      • 1...Se8+
        • 2.fxe8Q#
        • 2.fxe8B#
      • 1...Qxh4
        • 2.Sxc5#
      • 1...Sg5
        • 2.f8S#
      • 1...Sf6
        • 2.f8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 11
  • Sets
    • Q(a);N_GUARD,S_CUTP(d)::S(B),XB(b)
    • Q(a);P_PINP(F),XP(D)::S(B),XQ(a)
    • Q(a);N_GUARD,P_PINB(G),S_CUTP(d)::S(B),XB(b)
    • Q(a);N_GUARD,S_CUTP(d),XB(C)::S(B),XB(b)
    • S(f);N_GUARD::B(G)
    • S(f);CHECK,N_GUARD::B(G),XS(f)
  • Actual
    • P(F);P_SPINP(D)
    • Threat
      • R1(I)
    • Vars
      • Q(a);CHECK,XP(D)::S(B),XQ(a)
      • S(f);CHECK,OGATE::PXS(f)=Q
      • Q(a);N_GUARD,N_PINP(D),S_CUTP(d),XB(C)::S(B),XB(b)
      • S(h);N_GUARD::P=S
      • S(h);N_GUARD,N_PINP(D)::P=S
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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).