MESON Chess Problem Database

Problem Display
PID: 54618 (K7/7B/1p5r/3QB3/pN1Pn1p1/P1k2b1R/1pPp3q/1r1n2N1 w - - 0 1)

Sonnenfeld, Felix Alexander

3rd Comm., Goldschmidt MT, 1974

K7/7B/1p5r/3QB3/pN1Pn1p1/P1k2b1R/1pPp3q/1r1n2N1

#2

10 + 12

1077 Boletim da UBP 1985
5309 O Mosqueteiro do Rei 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Qf4
      • 2.Se2#
    • 1...Qxe5
      • 2.Se2#
    • 1...Qh1
      • 2.Se2#
    • 1...Qe2
      • 2.Sxe2#
    • 1...Sdf2
      • 2.Se2#
    • 1...Sef2
      • 2.Se2#
      • 2.Sa2#
    • 1...Sg3
      • 2.Sa2#
    • 1...Sc5
      • 2.Sa2#
    • 1...Sg5
      • 2.Sa2#
    • 1...Sd6
      • 2.Sa2#
    • 1...Sf6
      • 2.Sa2#
      • 2.Qc6#
  • Tries
    • 1.Rxf3+?
      • 1...Se3
        • 2.Rxe3#
      • 1...gxf3!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Qd3#
      • 1...Sef2+
        • 2.Sd5#
      • 1...Sg3+
        • 2.d5#
      • 1...Sc5+
        • 2.Sd5#
      • 1...Sg5+
        • 2.Sd5#
      • 1...Sd6+
        • 2.Sd5#
      • 1...Sf6+
        • 2.Qc6#
      • 1...Qe2
        • 2.Sxe2#
        • 2.d5#
      • 1...Sdf2
        • 2.Se2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(e);N_GUARD::S(A)
    • Q(e);N_GUARD,XB(H)::S(A)
    • Q(e);N_GUARD::S(A),XQ(e)
    • S(b);S_CUTQ(e)::S(A)
    • S(i);N_SPINB(g),P_PINQ(G)::S(E)
    • S(i);P_PINQ(G)::S(E)
  • Tries
    • Try
      • R(D);CHECK,XB(g)
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::R(D),XS(b)
      • Refutation
        • P(j);XR(D)
  • Actual
    • Q(G);
    • Threat
      • QAR1(G)
    • Vars
      • S(i);CHECK::S(E)
      • S(i);CHECK,N_SPINB(g),S_CUTQ(e)::B(H)+P(F)
      • S(i);CHECK,N_GUARD,S_CUTR(l)::QAR(G)
      • S(b);S_CUTQ(e)::S(A)
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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).