MESON Chess Problem Database

Problem Display
PID: 89882 (8/1K1Q1p1n/3p1P2/3P1Rp1/3Pk3/1N3pP1/8/1b1NBBb1 w - - 0 1)

Kovalic, Jan

Die Schwalbe, 1982

8/1K1Q1p1n/3p1P2/3P1Rp1/3Pk3/1N3pP1/8/1b1NBBb1

#2

11 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Be3
      • 2.Sc3#
    • 1...Bxd4
      • 2.Sd2#
  • Tries
    • 1.Rf4+?
      • 1...Kxd5
        • 2.Sc3#
        • 2.Qxf7#
      • 1...gxf4!
    • 1.Rxg5?
      • threat
        • 2.Qg4#
        • 2.Qf5#
        • 2.Qe8#
        • 2.Qe7#
      • 1...Bxd4
        • 2.Sd2#
        • 2.Qg4#
        • 2.Qf5#
      • 1...Sxf6
        • 2.Qf5#
        • 2.Qe7#
      • 1...f2
        • 2.Qg4#
        • 2.Qf5#
      • 1...Be3
        • 2.Sc3#
        • 2.Qf5#
        • 2.Qe8#
        • 2.Qe7#
      • 1...Sf8
        • 2.Qg4#
        • 2.Qf5#
      • 1...Sxg5!
  • Keys
    • 1.Rxf3!
      • threat
        • 2.Qf5#
      • 1...Kxf3
        • 2.Sd2#
      • 1...Kxd5
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • B(b);SBLOCK::S(A)
    • B(b);SBLOCK,XP(F)::S(D)
  • Tries
    • Try
      • R(H);CHECK
      • Refutation
        • P(e);XR(H)
    • Try
      • R(H);XP(e)
      • Threat
        • DUALS(4)
      • Refutation
        • S(h);XR(H)
  • Actual
    • R(H);XP(c)
    • Threat
      • QAB1(K)
    • Vars
      • K(d);S_FLIGHT,XR(H)::S(D)
      • K(d);P_SPINP(f),S_FLIGHT,XP(G)::S(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).