MESON Chess Problem Database

Problem Display
PID: 21155 (2BKb3/5p2/2p3p1/4nNp1/3QpkN1/2R4P/rr1q1n1P/2B5 w - - 0 1)

Promislo, Charles

1st Prize=, Good Companions (May), 1917

2BKb3/5p2/2p3p1/4nNp1/3QpkN1/2R4P/rr1q1n1P/2B5

#2

9 + 12

3132 The Good Companion Two-Mover 1922
20 De Problemist 1930
3098 FIDE Album (1914-1944) (I) 1971
56 The Problemist 2005
56 The Problemist 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc1
      • 2.Qxe5#
    • 1...Qe3
      • 2.Qxe3#
    • 1...Bd7
      • 2.Qxe5#
    • 1...Sd7
      • 2.Qxf2#
  • Tries
    • 1.Qxd2+?
      • 1...e3
        • 2.Qxe3#
      • 1...Rxd2+!
  • Keys
    • 1.Sg3!
      • threat
        • 2.Se2#
      • 1...Qxc1
        • 2.Qxe5#
      • 1...Qe3
        • 2.Qxe3#
      • 1...Sfd3
        • 2.Qxe4#
      • 1...Sed3
        • 2.Qf6#
      • 1...Bd7
        • 2.Qxe5#
      • 1...Sd7
        • 2.Qxf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(c);N_PINQ(E),N_SPINQ(c),XB(A)::QAB1(E),XS(g)
    • Q(c);N_PINQ(E)::QAB1(E),XQ(c)
    • B(l);N_PINQ(E)::QAB1(E),XS(g)
    • S(g);N_PINQ(E)::QAR2(E),XS(d)
  • Tries
    • Try
      • Q(E);CHECK,N_PINP(e),N_SPINQ(E),XQ(c)
      • Vars
        • P(e);P_SPINP(e)::QAB1(E),XP(e)
      • Refutation
        • R(b);CHECK,P_SPINR(b),XQ(E)
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • Q(c);N_PINQ(E),N_SPINQ(c),XB(A)::QAB1(E),XS(g)
      • Q(c);N_PINQ(E)::QAB1(E),XQ(c)
      • S(d);N_PINQ(E)::QAR1(E),XP(e)
      • S(g);N_PINQ(E)::QAR2(E)
      • B(l);N_PINQ(E)::QAB1(E),XS(g)
      • S(g);N_PINQ(E)::QAR2(E),XS(d)
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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).