MESON Chess Problem Database

Problem Display
PID: 249929 (8/3r1r2/2Q2p2/2P1kp2/8/2Kp2PB/8/8 w - - 0 1)

Ohquist, Johannes

Deutsche Schachzeitung, 1894

8/3r1r2/2Q2p2/2P1kp2/8/2Kp2PB/8/8

#2

5 + 6

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...f4
      • 2.Qe6#
  • Tries
    • 1.Bxf5?
      • threat
        • 2.Qe4#
        • 2.Qe6#
      • 1...Rd4
        • 2.Qe6#
      • 1...Rd5
        • 2.Qe6#
      • 1...Rd6
        • 2.Qe4#
      • 1...Rde7
        • 2.Qe4#
      • 1...Rfe7
        • 2.Qe4#
      • 1...Kxf5!
  • Keys
    • 1.Qf3!
      • threat
        • 2.Qxf5#
      • 1...Ke6
        • 2.Qe4#
      • 1...f4
        • 2.gxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(c);::QAR1(E)
  • Tries
    • Try
      • B(C);XP(c)
      • Threat
        • DUALS(2)
      • Vars
        • R(e);::QAR1(E)
        • R(f);::QAR1(E)
      • Refutation
        • K(b);P-FLIGHT,XB(C)
  • Actual
    • Q(E);
    • Threat
      • QAR1(E),XP(c)
    • Vars
      • K(b);N_GUARD,P-FLIGHT,P_SPINP(c)::QAR2(E)
      • P(c);OGATE::P(B),XP(c)
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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).