MESON Chess Problem Database

Problem Display
PID: 4920 (7b/6n1/1K1pPQ2/3k4/1R2p1N1/5N2/2n1P3/3r4 w - - 0 1)

Pospisil, Josef

Besedy lidu, 1894

7b/6n1/1K1pPQ2/3k4/1R2p1N1/5N2/2n1P3/3r4

#2

7 + 7

3804 Ceske Melodie 1908

SOLUTION

  • SOUND
  • Sets
    • 1...Sa1
      • 2.Se3#
    • 1...Se1
      • 2.Se3#
    • 1...Sa3
      • 2.Se3#
    • 1...Se3
      • 2.Sxe3#
    • 1...Sxb4
      • 2.Se3#
    • 1...Sd4
      • 2.Se3#
    • 1...exf3
      • 2.e4#
  • Tries
    • 1.Rd4+?
      • 1...Sxd4
        • 2.Se3#
      • 1...Rxd4!
  • Keys
    • 1.Qf7!
      • threat
        • 2.Sf6#
      • 1...Sxb4
        • 2.Se3#
      • 1...Sxe6
        • 2.Qb7#
      • 1...exf3
        • 2.e4#
      • 1...Sf5
        • 2.e7#
      • 1...Sh5
        • 2.e7#
      • 1...Se8
        • 2.e7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • S(b);N_GUARD::S(D)
    • S(b);N_GUARD::S(D),XS(b)
    • S(b);N_GUARD,XR(C)::S(D)
    • P(c);OGATE,XS(B)::P(A)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • S(b);XR(C)::S(D)
      • Refutation
        • R(a);XR(C)
  • Actual
    • Q(G);
    • Threat
      • S(D)
    • Vars
      • S(b);N_GUARD,XR(C)::S(D)
      • S(f);P_SPINS(f),SBLOCK,XP(F)::QAB(G)
      • P(c);OGATE,XS(B)::P(A)
      • S(f);N_GUARD::QAB(G)+P(F)
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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).