MESON Chess Problem Database

Problem Display
PID: 84463 (b2BKn2/3P1B2/8/5k2/2NR4/bQ2p3/3n4/3rqN2 w - - 0 1)

Funk, Jacob E

Good Companions, 1920

b2BKn2/3P1B2/8/5k2/2NR4/bQ2p3/3n4/3rqN2

#2

8 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qg3
      • 2.Sxg3#
    • 1...Qh4
      • 2.Sfxe3#
    • 1...Qe2
      • 2.Sg3#
    • 1...e2
      • 2.Sfe3#
      • 2.Qh3#
  • Tries
    • 1.Qb5+?
      • 1...Bd5
        • 2.Qxd5#
      • 1...Bc5!
  • Keys
    • 1.Qxe3!
      • threat
        • 2.Rf4#
      • 1...Qxe3+
        • 2.Sfxe3#
      • 1...Qxf1
        • 2.Qg5#
        • 2.Qe5#
      • 1...Be7
        • 2.Qf4#
      • 1...Be4
        • 2.Qg5#
      • 1...Se4
        • 2.Qf3#
      • 1...Qf2
        • 2.Qg5#
        • 2.Qh3#
        • 2.Qe5#
      • 1...Qg3
        • 2.Sxg3#
      • 1...Qh4
        • 2.Qe5#
      • 1...Bd6
        • 2.Sxd6#
      • 1...Se6
        • 2.Qh3#
      • 1...Sg6
        • 2.Be6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • Q(b);N_GUARD::S(A),XQ(b)
    • Q(b);N_GUARD::S(A),XP(e)
    • Q(b);N_GUARD::S(A)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • B(g);N_GUARD,P_SPINB(g)::QAR2(B),XB(g)
      • Refutation
        • B(d);P_SPINB(d)
  • Actual
    • Q(B);P_SPINQ(B),XP(e)
    • Threat
      • R1(D)
    • Vars
      • Q(b);CHECK,XQ(B)::S(A),XQ(b)
      • B(d);N_PINQ(B)::QAR1(B)
      • B(g);N_PINQ(B)::QAR1(B)
      • S(c);N_PINQ(B)::QAR2(B)
      • Q(b);N_GUARD,N_PINQ(B)::S(A),XQ(b)
      • Q(b);N_GUARD,N_PINQ(B)::QAR1(B)
      • B(d);N_GUARD::S(C),XB(d)
      • S(h);N_PINQ(B)::QAB(B)
      • S(h);N_GUARD,SBLOCK::B(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).