MESON Chess Problem Database

Problem Display
PID: 243319 (2Q2B2/4p3/1p6/1N1k1nNR/3p1P2/6P1/4P3/4K3 w - - 0 1)

Andersson, Sven Tore

Il Due Mosse, 1956

2Q2B2/4p3/1p6/1N1k1nNR/3p1P2/6P1/4P3/4K3

#2

9 + 5

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...d3
      • 2.e4#
    • 1...e5
      • 2.Qe6#
    • 1...e6
      • 2.Qxe6#
  • Tries
    • 1.Sc3+?
      • 1...Kd6
        • 2.Sge4#
        • 2.Sf7#
      • 1...dxc3!
    • 1.Sa7?
      • threat
        • 2.Qc6#
      • 1...Kd6
        • 2.Qc6#
      • 1...d3!
    • 1.Sh7?
      • 1...Ke4
        • 2.Qe6#
      • 1...e5
        • 2.Sf6#
      • 1...e6
        • 2.Sf6#
      • 1...d3!
  • Keys
    • 1.Se4!
      • 1...Kxe4
        • 2.Qe6#
      • 1...d3
        • 2.Sec3#
      • 1...e5
        • 2.Sf6#
      • 1...e6
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(a);N_GUARD::P(B)
    • P(e);::QAB1(H)
    • P(e);::QAB1(H),XP(e)
  • Tries
    • Try
      • S(E);CHECK
      • Refutation
        • P(a);XS(E)
    • Try
      • S(E);
      • Threat
        • QAB1(H)
      • Vars
        • K(b);P-FLIGHT,P_SPINP(e)::QAR1(H)
      • Refutation
        • P(a);
    • Try
      • S(F);P_PINS(c)
      • Vars
        • K(b);N_SPINS(c),S_FLIGHT::QAR2(H)
        • P(e);N_GUARD,N_SPINS(c)::S(F)
        • P(e);N_GUARD::S(F)
      • Refutation
        • P(a);
  • Actual
    • S(F);P_PINS(c)
    • Vars
      • K(b);N_SPINS(c),S_FLIGHT,XS(F)::QAR2(H)
      • P(a);N_GUARD::S(F)
      • P(e);N_GUARD,N_SPINS(c)::S(F)
      • P(e);N_GUARD::S(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).