MESON Chess Problem Database

Problem Display
PID: 10888 (2Nq4/1npP4/2k2NQ1/p4P2/3P2P1/1R3K2/6r1/7B w - - 0 1)

ten Cate, Pieter

Problem (Zagreb), 1969

2Nq4/1npP4/2k2NQ1/p4P2/3P2P1/1R3K2/6r1/7B

#2

10 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qe8
      • 2.dxe8Q#
      • 2.dxe8B#
    • 1...Re2
      • 2.Kxe2#
    • 1...Rf2+
      • 2.Kxf2#
    • 1...Rg3+
      • 2.Kxg3#
    • 1...Rxg4
      • 2.Kxg4#
    • 1...Sc5
      • 2.d5#
    • 1...Sd6
      • 2.Sa7#
  • Keys
    • 1.Qe8!
      • threat
        • 2.Qe4#
      • 1...Rf2+
        • 2.Kxf2#
      • 1...Rg3+
        • 2.Kxg3#
      • 1...Qxf6
        • 2.d8Q#
        • 2.d8R#
      • 1...Qxd7
        • 2.Qxd7#
      • 1...Qxc8
        • 2.dxc8S#
      • 1...Qxe8
        • 2.dxe8Q#
        • 2.dxe8B#
      • 1...Rxg4
        • 2.Kxg4#
      • 1...Qe7
        • 2.d8S#
      • 1...Re2
        • 2.Kxe2#
      • 1...Sc5
        • 2.d5#
      • 1...Sd6
        • 2.Sa7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(f);OGATE::PXQ(f)=Q
    • R(a);::B(A)+K(C),XR(a)
    • R(a);CHECK::B(A)+K(C),XR(a)
    • R(a);XP(E)::B(A)+K(C),XR(a)
    • S(d);SBLOCK::P(D)
    • S(d);SBLOCK::S(J)
  • Actual
    • Q(H);
    • Threat
      • QAB(H)
    • Vars
      • R(a);CHECK::B(A)+K(C),XR(a)
      • Q(f);OGATE,P_PINP(F),XS(G)::P=Q
      • Q(f);OGATE,P_SPINQ(f),XP(I)::QAB1(H),XQ(f)
      • Q(f);OGATE,XS(J)::PXQ(f)=S
      • Q(f);OGATE,XQ(H)::PXQ(f)=Q
      • R(a);XP(E)::B(A)+K(C),XR(a)
      • Q(f);OGATE::P=S
      • R(a);::B(A)+K(C),XR(a)
      • S(d);SBLOCK::P(D)
      • S(d);SBLOCK::S(J)
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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).