MESON Chess Problem Database

Problem Display
PID: 21779 (4R2b/5r1b/7q/2P1p2p/1B2p3/Q7/2N1kP1N/5R1K w - - 0 1)

Sheppard, Charles William

Good Companions (October), 1921

4R2b/5r1b/7q/2P1p2p/1B2p3/Q7/2N1kP1N/5R1K

#2

9 + 8

3132 The Good Companion Two-Mover 1922
5064 100 Years of the American Two-move Chess Problem 1962

SOLUTION

  • SOUND
  • Sets
    • 1...Qc1
      • 2.Qa6#
    • 1...Qe3
      • 2.Qxe3#
    • 1...Qf4
      • 2.Qa6#
    • 1...Qg5
      • 2.Qa6#
    • 1...Qg7
      • 2.Qe3#
      • 2.Qa6#
    • 1...Qf8
      • 2.Qe3#
      • 2.Qa6#
    • 1...Qa6
      • 2.Qe3#
      • 2.Qxa6#
    • 1...Qb6
      • 2.Qe3#
    • 1...Qc6
      • 2.Qe3#
    • 1...Qd6
      • 2.Qe3#
    • 1...Qe6
      • 2.Qe3#
    • 1...Qf6
      • 2.Qe3#
    • 1...Qg6
      • 2.Qe3#
    • 1...Rxf2
      • 2.Re1#
    • 1...Rf4
      • 2.Qe3#
    • 1...Bg6
      • 2.Qa6#
    • 1...Bf6
      • 2.Qa6#
  • Tries
    • 1.Qd3+?
      • 1...exd3
        • 2.Sd4#
      • 1...Kxd3!
  • Keys
    • 1.f4!
      • threat
        • 2.Qe3#
      • 1...Qxf4
        • 2.Qa6#
      • 1...exf4
        • 2.Qf3#
      • 1...exf4 ep
        • 2.Sd4#
      • 1...e3
        • 2.Qxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 13
  • Sets
    • Q(e);N_GUARD,P_PINR(A)::QAB(F)
    • Q(e);N_GUARD::QAR1(F),XQ(e)
    • Q(e);N_GUARD::QAB(F)
    • Q(e);N_GUARD::QAR1(F)
    • R(f);SBLOCK,XP(D)::R1(A)
    • R(f);S_CUTQ(e)::QAR1(F)
    • B(g);S_CUTQ(e)::QAB(F)
    • B(h);S_CUTQ(e)::QAB(F)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • P(b);P_SPINP(c),SBLOCK,XQ(F)::S(C)
      • Refutation
        • K(a);S_FLIGHT,XQ(F)
  • Actual
    • P(D);
    • Threat
      • QAR1(F)
    • Vars
      • Q(e);N_GUARD,XP(D)::QAB(F)
      • P(c);P_SPINP(b),XP(D)::QAB1(F)
      • P(b);EP,P_SPINP(c),XP(D)::S(C)
      • P(b);::QAR1(F),XP(b)
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).