MESON Chess Problem Database

Problem Display
PID: 77445 (3Q4/2N3b1/1Kp5/1Rp5/2k5/1R6/8/5b2 w - - 0 1)

Hermanson, Halvar

Themes-64, 1958

3Q4/2N3b1/1Kp5/1Rp5/2k5/1R6/8/5b2

#2

5 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Bg2
      • 2.Qd3#
    • 1...Bd3
      • 2.Qxd3#
    • 1...Bh3
      • 2.Qd3#
    • 1...Bd4
      • 2.Qg8#
    • 1...Bf8
      • 2.Qh4#
    • 1...cxb5
      • 2.Qd5#
  • Tries
    • 1.Qd6?
      • threat
        • 2.Qxc5#
      • 1...cxb5
        • 2.Qd5#
      • 1...Bd4
        • 2.Qe6#
      • 1...Bf8
        • 2.Qf4#
      • 1...Bc3!
  • Keys
    • 1.Qd1!
      • threat
        • 2.Rxc5#
      • 1...cxb5
        • 2.Qd5#
      • 1...Bd3
        • 2.Qxd3#
      • 1...Bd4
        • 2.Qxf1#
      • 1...Bf8
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • B(a);N_GUARD::QAB1(E)
    • B(a);N_GUARD::QAB1(E),XB(a)
    • B(e);SBLOCK::QAB(E)
    • B(e);N_GUARD::QAR(E)
    • P(d);N_GUARD,XR(B)::QAB1(E)
  • Tries
    • Try
      • Q(E);
      • Threat
        • QAR1(E),XP(c)
      • Vars
        • P(d);N_GUARD,XR(B)::QAB1(E)
        • B(e);SBLOCK::QAB(E)
        • B(e);N_GUARD::QAR(E)
      • Refutation
        • B(e);
  • Actual
    • Q(E);
    • Threat
      • R1(B),XP(c)
    • Vars
      • P(d);N_GUARD,XR(B)::QAB1(E)
      • B(a);N_GUARD::QAB1(E),XB(a)
      • B(e);SBLOCK::QAB(E),XB(a)
      • B(e);N_GUARD::QAR(E)
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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).