MESON Chess Problem Database

Problem Display
PID: 58325 (2B4R/4B3/2K5/2P3qn/R1P4k/4N1pr/6Q1/6nb w - - 0 1)

Hjelle, David

Chess Life, 1959

2B4R/4B3/2K5/2P3qn/R1P4k/4N1pr/6Q1/6nb

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qf6+
      • 2.Bxf6#
    • 1...Bxg2+
      • 2.Sxg2#
    • 1...Sf3
      • 2.Qxh3#
  • Tries
    • 1.Bg4?
      • threat
        • 2.Rxh5#
      • 1...Qf6+
        • 2.Bxf6#
      • 1...Bxg2+!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Bxg5#
      • 1...Qf6+
        • 2.Bxf6#
      • 1...Bxd5+
        • 2.cxd5#
      • 1...Qxe7
        • 2.Rxh5#
      • 1...g2
        • 2.Qxg5#
      • 1...Sf3
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(f);CHECK,OGATEB::B(G),XQ(f)
    • B(b);CHECK,XQ(A)::S(B),XB(b)
    • S(a);N_PINQ(A)::QAR1(A),XR(d)
  • Tries
    • Try
      • B(H);
      • Threat
        • R1(I),XS(g)
      • Vars
        • Q(f);CHECK,OGATEB::B(G),XQ(f)
      • Refutation
        • B(b);CHECK,XQ(A)
  • Actual
    • Q(A);
    • Threat
      • B(G),XQ(f)
    • Vars
      • Q(f);CHECK,OGATEB::B(G),XQ(f)
      • B(b);CHECK,OGATE,XQ(A)::R(C)+P(D),XB(b)
      • Q(f);N_SPINQ(f),XB(G)::R1(I),XS(g)
      • P(c);N_PINQ(A)::QAB1(A),XQ(f)
      • S(a);N_PINQ(A),S_CUTB(b)::QAR(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).