MESON Chess Problem Database

Problem Display
PID: 90842 (8/8/3p4/K1k5/2p1Q3/8/bPnP4/2R5 w - - 0 1)

Jonsson, Gustav

Die Schwalbe, 1960

8/8/3p4/K1k5/2p1Q3/8/bPnP4/2R5

#2

5 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sa1
      • 2.b4#
      • 2.d4#
    • 1...Se1
      • 2.b4#
      • 2.d4#
    • 1...Sa3
      • 2.b4#
      • 2.d4#
    • 1...Se3
      • 2.b4#
      • 2.d4#
    • 1...Sb4
      • 2.d4#
    • 1...Sd4
      • 2.b4#
  • Tries
    • 1.Rxc2?
      • threat
        • 2.b4#
        • 2.d4#
      • 1...Bb3
        • 2.d4#
      • 1...c3
        • 2.b4#
      • 1...d5!
    • 1.b4+?
      • 1...Sxb4
        • 2.d4#
      • 1...cxb4 ep!
  • Keys
    • 1.d4+!
      • 1...Sxd4
        • 2.b4#
      • 1...cxd4 ep
        • 2.b4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • S(b);N_GUARD,P_SPINP(c)::P(C)
    • S(b);N_GUARD,P_SPINP(c)::P(B)
  • Tries
    • Try
      • R(A);P_PINP(c),XS(b)
      • Threat
        • DUALS(2)
      • Vars
        • B(a);::P(C)
        • P(c);::P(B)
      • Refutation
        • P(e);
    • Try
      • P(B);CHECK
      • Vars
        • S(b);P_SPINP(c),XP(B)::P(C)
      • Refutation
        • P(c);EP,P_SPINS(b),XP(B)
  • Actual
    • P(C);CHECK
    • Vars
      • S(b);P_SPINP(c),XP(C)::P(B)
      • P(c);EP,P_SPINS(b),XP(C)::P(B)
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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).