MESON Chess Problem Database

Problem Display
PID: 201557 (4n3/8/4p1N1/5k1b/Q2p1NRB/1n1p4/6B1/6K1 w - - 0 1)

Wahlmark, Carl Primus

Good Companions, 1922

4n3/8/4p1N1/5k1b/Q2p1NRB/1n1p4/6B1/6K1

#2

7 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sf6
      • 2.Rg5#
    • 1...e5
      • 2.Qd7#
  • Tries
    • 1.Sxh5?
      • threat
        • 2.Rg5#
      • 1...e5
        • 2.Qd7#
      • 1...Kxg4!
    • 1.Qb5+?
      • 1...Kxg4
        • 2.Qg5#
        • 2.Qxh5#
      • 1...e5
        • 2.Qd7#
      • 1...Sc5!
    • 1.Qxe8?
      • threat
        • 2.Qxe6#
      • 1...Kxg4
        • 2.Qxe6#
      • 1...e5
        • 2.Qd7#
        • 2.Qe6#
        • 2.Qc8#
      • 1...Sc5!
  • Keys
    • 1.Sd5!
      • threat
        • 2.Rg5#
      • 1...Kxg4
        • 2.Se3#
      • 1...Bxg4
        • 2.Sde7#
      • 1...exd5
        • 2.Qd7#
      • 1...e5
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • S(g);SBLOCK::R1(E)
    • P(f);OGATEB::QAB(C)
  • Tries
    • Try
      • S(D);XB(e)
      • Threat
        • R1(E)
      • Vars
        • P(f);OGATEB::QAB(C)
      • Refutation
        • K(d);P_SPINP(c),S_FLIGHT,XR(E)
    • Try
      • Q(C);CHECK
      • Vars
        • P(f);OGATEB,P_SPINP(f)::QAB(C)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(C);XS(g)
      • Threat
        • QAB1(C),XP(f)
      • Vars
        • K(d);S_FLIGHT,XR(E)::QAB(C),XP(f)
      • Refutation
        • S(a);
  • Actual
    • S(D);
    • Threat
      • R1(E)
    • Vars
      • K(d);P_SPINP(c),S_FLIGHT,XR(E)::S(D)
      • B(e);SBLOCK,XR(E)::S(D)
      • P(f);OGATEB,XS(D)::QAB(C)
      • P(f);OGATEB::QAB(C)
HTML5 logo

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).