MESON Chess Problem Database

Problem Display
PID: 146035 (2n4b/3NB3/pp1N4/k5qR/p5p1/2R1Q3/2P1K3/4n3 w - - 0 1)

Rothstein, Louis

Good Companions (January black Queen), 1918

2n4b/3NB3/pp1N4/k5qR/p5p1/2R1Q3/2P1K3/4n3

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qb5+
      • 2.Sc4#
    • 1...Bxc3
      • 2.Qxc3#
    • 1...Sxd6
      • 2.Qxb6#
    • 1...Sa7
      • 2.Qxb6#
    • 1...Sxe7
      • 2.Qxb6#
    • 1...b5
      • 2.Sb7#
  • Tries
    • 1.Rxg5+?
      • 1...Kb4
        • 2.Sxc8#
        • 2.Rc4#
      • 1...b5
        • 2.Sc4#
        • 2.Sb7#
      • 1...Be5!
  • Keys
    • 1.Qd2!
      • threat
        • 2.Rc5#
      • 1...Qb5+
        • 2.Sc4#
      • 1...Qe5+
        • 2.Re3#
      • 1...Kb4
        • 2.Rb3#
      • 1...Bxc3
        • 2.Qxc3#
      • 1...a3
        • 2.Rxa3#
      • 1...Qc5
        • 2.Rcxc5#
      • 1...b5
        • 2.Sb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • Q(e);CHECK::S(F)
    • B(i);OGATE,XR(C)::QAB(D),XB(i)
    • S(h);N_GUARD,XS(F)::QAB1(D),XP(g)
    • S(h);N_GUARD::QAB1(D),XP(g)
    • S(h);N_GUARD,XB(H)::QAB1(D),XP(g)
    • P(g);N_SPINQ(e),SBLOCK::S(F)
  • Tries
    • Try
      • R(E);CHECK,XQ(e)
      • Refutation
        • B(i);P_SPINB(i)
  • Actual
    • Q(D);
    • Threat
      • QAB(D)+R(C),DCHECK
    • Vars
      • Q(e);CHECK::S(F)
      • Q(e);CHECK,S_CUTB(i)::QAB(D)+R(C)
      • K(d);N_SPINQ(e),S_FLIGHT::QAB(D)+R(C),DCHECK
      • B(i);OGATE,P_SPINB(i),XR(C)::QAB(D),XB(i)
      • P(b);::QAB(D)+R(C),DCHECK,XP(b)
      • Q(e);::QAB(D)+R(C),DCHECK,XQ(e)
      • P(g);N_SPINQ(e),SBLOCK::S(F)
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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).