MESON Chess Problem Database

Problem Display
PID: 119857 (1q4R1/1pQ5/4B3/6RP/5b1k/8/4K1P1/8 w - - 0 1)

Schuld, Henk L

Alkmaarsche Courant, 1910

1q4R1/1pQ5/4B3/6RP/5b1k/8/4K1P1/8

#2

7 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qa7
      • 2.Qxf4#
    • 1...Qa8
      • 2.Qxf4#
    • 1...Qc8
      • 2.Qxf4#
    • 1...Qd8
      • 2.Qxf4#
    • 1...Qe8
      • 2.Qxf4#
    • 1...Qxg8
      • 2.Qxf4#
    • 1...Bc1
      • 2.g3#
    • 1...Bd2
      • 2.g3#
    • 1...Be3
      • 2.g3#
  • Tries
    • 1.Qc4?
      • threat
        • 2.g3#
      • 1...Qxg8
        • 2.Qxf4#
      • 1...Qe5+!
  • Keys
    • 1.Rh8!
      • threat
        • 2.Rg4#
      • 1...Kxg5
        • 2.Qe7#
      • 1...Qxh8
        • 2.Qxf4#
      • 1...Bxg5
        • 2.g3#
      • 1...Qg8
        • 2.Qxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • Q(d);N_GUARD::QAR2(F),XB(a)
    • Q(d);N_GUARD,P_PINB(E)::QAR2(F),XB(a)
    • Q(d);N_GUARD,XR(G)::QAR2(F),XB(a)
    • B(a);N_GUARD::P(B)
  • Tries
    • Try
      • Q(F);P_PINB(a)
      • Threat
        • P(B)
      • Vars
        • Q(d);N_GUARD,XR(G)::QAR2(F),XB(a)
      • Refutation
        • Q(d);CHECK
  • Actual
    • R(G);
    • Threat
      • R1(C)
    • Vars
      • K(b);OGATEB,S_FLIGHT,XR(C)::QAB(F)
      • Q(d);N_GUARD,XR(G)::QAR2(F),XB(a)
      • B(a);N_GUARD,SBLOCK,XR(C)::P(B)
      • Q(d);N_GUARD::QAR2(F),XB(a)
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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).