MESON Chess Problem Database

Problem Display
PID: 258026 (3N4/1K6/4R3/1QPp1k2/2p3pP/1Pb2bP1/1qP1P3/1B3R2 w - - 0 1)

van Beek, Huibrecht

Probleemblad, 1948

3N4/1K6/4R3/1QPp1k2/2p3pP/1Pb2bP1/1qP1P3/1B3R2

#2

12 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc2
      • 2.Bxc2#
    • 1...Qxb3
      • 2.cxb3#
    • 1...cxb3
      • 2.Qd3#
    • 1...d4+
      • 2.c6#
  • Tries
    • 1.Qd7?
      • threat
        • 2.Qh7#
      • 1...Qxb3+
        • 2.cxb3#
      • 1...d4+
        • 2.Qd5#
      • 1...Bg7!
  • Keys
    • 1.Qxc4!
      • threat
        • 2.Qd3#
        • 2.Qf4#
      • 1...Qxb3+
        • 2.cxb3#
      • 1...dxc4+
        • 2.e4#
      • 1...d4+
        • 2.Qd5#
      • 1...Qxc2
        • 2.Bxc2#
        • 2.Qf4#
      • 1...Bf6
        • 2.Qd3#
      • 1...Qc1
        • 2.Qd3#
      • 1...Bd2
        • 2.Qd3#
      • 1...Bd4
        • 2.Qd3#
      • 1...Be5
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 2
  • Sets
    • Q(a);OGATE,P_SPINQ(a),XP(C)::B(A),XQ(a)
    • Q(a);OGATE,P_PINQ(H),XP(E)::B(A)+P(C),XQ(a)
    • P(d);OGATE,XP(E)::QAB(H)
    • P(f);CHECK::QAR(H)+P(I)
  • Tries
    • Try
      • Q(H);P_SPINP(E)
      • Threat
        • QAB(H)
      • Vars
        • Q(a);CHECK,OGATE,XP(E)::B(A)+P(C),XQ(a)
        • P(f);CHECK,S_CUTB(b)::QAR2(H)
      • Refutation
        • B(b);
  • Actual
    • Q(H);P_SPINP(E),XP(d)
    • Threat
      • DUALS(2)
    • Vars
      • Q(a);CHECK,OGATE,XP(E)::B(A)+P(C),XQ(a)
      • P(f);CHECK,N_GUARD,XQ(H)::P(D)
      • P(f);CHECK,S_CUTB(b)::QAR2(H)
      • B(b);::QAB(H)
      • Q(a);N_PINP(E)::QAB(H)
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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).