MESON Chess Problem Database

Problem Display
PID: 5026 (8/2R5/5n2/5K2/1p1k4/5Q2/8/6b1 w - - 0 1)

Halses, B

Deutsches Wochenschach, 1897

8/2R5/5n2/5K2/1p1k4/5Q2/8/6b1

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Se4
      • 2.Qxe4#
    • 1...Sg4
      • 2.Qe4#
    • 1...Sd5
      • 2.Qe4#
    • 1...Sh5
      • 2.Qe4#
    • 1...Sd7
      • 2.Qe4#
    • 1...Sh7
      • 2.Qe4#
    • 1...Se8
      • 2.Qe4#
    • 1...Sg8
      • 2.Qe4#
  • Tries
    • 1.Qc3+?
      • 1...Kd5
        • 2.Qe5#
      • 1...bxc3!
    • 1.Qf4+?
      • 1...Kd5
        • 2.Qe5#
      • 1...Se4
        • 2.Qxe4#
      • 1...Kd3!
  • Keys
    • 1.Qe2!
      • threat
        • 2.Qd2#
      • 1...Kd5
        • 2.Qe5#
      • 1...Be3
        • 2.Qc4#
      • 1...Se4
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 7
  • Sets
    • S(d);N_GUARD::QAR1(A),XS(d)
    • S(d);N_GUARD::QAR1(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);OGATE,P-FLIGHT::QAR1(A)
      • Refutation
        • P(b);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(A)
        • S(d);N_GUARD,P_SPINS(d)::QAR1(A),XS(d)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAR2(A)
    • Vars
      • K(c);P-FLIGHT::QAR1(A)
      • B(a);SBLOCK::QAR1(A)
      • S(d);N_GUARD::QAR1(A),XS(d)
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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).