MESON Chess Problem Database

Problem Display
PID: 258405 (2K3n1/2b2N1b/7p/4P2p/1Q2P2k/3R3P/2Np4/7R w - - 0 1)

Mohl, Josef

Die Schwalbe, 1931

2K3n1/2b2N1b/7p/4P2p/1Q2P2k/3R3P/2Np4/7R

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Bxe4
      • 2.Qxe4#
    • 1...Bf5+
      • 2.exf5#
    • 1...Se7+
      • 2.Qxe7#
    • 1...d1B
      • 2.Qe1#
  • Tries
    • 1.Qe7+?
      • 1...Sf6
        • 2.Qxf6#
      • 1...Sxe7+!
  • Keys
    • 1.Se1!
      • threat
        • 2.Sg2#
      • 1...Bf5+
        • 2.exf5#
      • 1...Se7+
        • 2.Qxe7#
      • 1...dxe1Q
        • 2.Qxe1#
      • 1...dxe1S
        • 2.Qxe1#
      • 1...dxe1B
        • 2.Qxe1#
      • 1...dxe1R
        • 2.Qxe1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • B(f);OGATE,P_SPINB(f),XP(F)::QAR(E),XB(f)
    • B(f);CHECK,OGATE::QAR(E)+P(F),XB(f)
    • S(g);CHECK,N_GUARD::QAB(E),XS(g)
    • P(a);OGATE::QAB(E)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::QAB(E),XS(g)
      • Refutation
        • S(g);CHECK,XQ(E)
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • B(f);CHECK,OGATE::QAR(E)+P(F),XB(f)
      • S(g);CHECK,N_GUARD::QAB(E),XS(g)
      • P(a);OGATE,XS(B)::QAB(E),XQ(a)
      • P(a);OGATE,XS(B)::QAB(E),XS(a)
      • P(a);OGATE,XS(B)::QAB(E),XB(a)
      • P(a);OGATE,XS(B)::QAB(E),XR(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).