MESON Chess Problem Database

Problem Display
PID: 101023 (Q7/5p2/1N4b1/1p1P2rN/5R2/p1P1k1p1/2n1P3/bB1K4 w - - 0 1)

Stillingfleet Johnson, George

Good Companions, 1920

Q7/5p2/1N4b1/1p1P2rN/5R2/p1P1k1p1/2n1P3/bB1K4

#2

9 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd5+
      • 2.Sxd5#
    • 1...Sb4
      • 2.Rf3#
    • 1...b4
      • 2.Sc4#
  • Tries
    • 1.Qe8+?
      • 1...Be4
        • 2.Rf3#
        • 2.Qxe4#
      • 1...Re5!
  • Keys
    • 1.Qa4!
      • threat
        • 2.Rf3#
      • 1...Rxd5+
        • 2.Sxd5#
      • 1...Bxh5
        • 2.Qe4#
      • 1...bxa4
        • 2.Sc4#
      • 1...Rf5
        • 2.Qe4#
      • 1...Be4
        • 2.Qxe4#
      • 1...Se1
        • 2.Qd4#
      • 1...Sd4
        • 2.Qxd4#
      • 1...b4
        • 2.Sc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • R(g);CHECK,XP(F)::S(H),XR(g)
    • S(b);::R1(E)
    • P(f);N_GUARD::S(H)
  • Tries
    • Try
      • Q(I);CHECK
      • Refutation
        • R(g);P_SPINR(g)
  • Actual
    • Q(I);
    • Threat
      • R1(E)
    • Vars
      • R(g);CHECK,XP(F)::S(H),XR(g)
      • B(h);N_GUARD,P_PINP(C),XS(G)::QAR1(I)
      • P(f);N_GUARD,XQ(I)::S(H)
      • R(g);S_CUTB(h)::QAR1(I)
      • B(h);N_GUARD::QAR1(I),XB(h)
      • S(b);N_GUARD::QAB1(I)
      • S(b);N_GUARD::QAB1(I),XS(b)
      • P(f);N_GUARD::S(H)
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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).