MESON Chess Problem Database

Problem Display
PID: 177439 (4B3/K7/1p6/k1PN4/8/b4Q2/2r5/1n6 w - - 0 1)

Schoen, Gerhard Ernst

Probleemblad, 1978

4B3/K7/1p6/k1PN4/8/b4Q2/2r5/1n6

#2

5 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2
      • 2.Qxa3#
  • Tries
    • 1.Qd3?
      • threat
        • 2.Qb5#
        • 2.Qa6#
      • 1...Rxc5
        • 2.Qa6#
      • 1...b5
        • 2.Qxb5#
      • 1...Rb2
        • 2.Qa6#
      • 1...Sc3
        • 2.Qa6#
      • 1...Rc4!
  • Keys
    • 1.Qb3!
      • threat
        • 2.Qa4#
        • 2.Qb5#
        • 2.Qxb6#
      • 1...Rxc5
        • 2.Qa4#
        • 2.Qxb6#
      • 1...Bxc5
        • 2.Qa4#
        • 2.Qb5#
      • 1...bxc5
        • 2.Qa4#
        • 2.Qb5#
        • 2.Qb6#
      • 1...Rc4
        • 2.Qb5#
        • 2.Qxb6#
      • 1...Rb2
        • 2.Qa4#
      • 1...Bb4
        • 2.Qa4#
        • 2.Qxb4#
      • 1...Sc3
        • 2.Qxb6#
      • 1...b5
        • 2.Qxb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • S(a);N_GUARD::QAR2(A),XB(c)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);XP(B)::QAR1(A)
        • P(e);::QAR1(A),XP(e)
        • R(b);::QAR1(A)
        • S(a);::QAR1(A)
      • Refutation
        • R(b);
  • Actual
    • Q(A);
    • Threat
      • DUALS(3)
    • Vars
      • R(b);::QAR1(A)
      • S(a);::QAB1(A),XP(e)
      • P(e);::QAR1(A),XP(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).