MESON Chess Problem Database

Problem Display
PID: 88407 (6Qb/2B1pr1b/6np/2pPP1NK/2R1pk1P/3n2p1/1pB1RpP1/8 w - - 0 1)

Fraenkel, Febus Hirsch

The Problemist, 1931

6Qb/2B1pr1b/6np/2pPP1NK/2R1pk1P/3n2p1/1pB1RpP1/8

#2

11 + 13

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rf5
      • 2.Rexe4#
      • 2.Rcxe4#
    • 1...Bxe5
      • 2.Qxf7#
  • Tries
    • 1.Qxg6?
      • threat
        • 2.Sh3#
        • 2.Se6#
        • 2.Rexe4#
        • 2.Rcxe4#
      • 1...hxg5
        • 2.Rexe4#
        • 2.Rcxe4#
        • 2.Qxg5#
      • 1...Rf5
        • 2.Rexe4#
        • 2.Rcxe4#
      • 1...Rf6
        • 2.Sh3#
        • 2.Rexe4#
        • 2.Rcxe4#
      • 1...e6
        • 2.Sh3#
        • 2.Sxe6#
        • 2.Rexe4#
        • 2.Rcxe4#
      • 1...Bxg6+!
    • 1.Qc8?
      • threat
        • 2.Sh3#
        • 2.Rexe4#
        • 2.Rcxe4#
        • 2.Qg4#
      • 1...Sxh4
        • 2.Sh3#
        • 2.Qg4#
      • 1...Sgxe5
        • 2.Sh3#
        • 2.Qg4#
      • 1...hxg5
        • 2.Rexe4#
        • 2.Rcxe4#
        • 2.Qg4#
      • 1...Rf5
        • 2.Rexe4#
        • 2.Rcxe4#
      • 1...Sf8
        • 2.Sh3#
        • 2.Qg4#
      • 1...e6!
  • Keys
    • 1.Sxe4!
      • threat
        • 2.Sd6#
      • 1...Rf5+
        • 2.Sg5#
      • 1...Kf5
        • 2.Sxg3#
      • 1...Bxe5
        • 2.Qxf7#
      • 1...Sdxe5
        • 2.Sd2#
        • 2.Sxf2#
        • 2.Sc3#
        • 2.Sxc5#
        • 2.Sg5#
        • 2.Sf6#
      • 1...Sxh4
        • 2.Qg4#
      • 1...Sgxe5
        • 2.Qg4#
      • 1...Sf8
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • B(m);N_GUARD,P_SPINB(m),XP(G)::QAR(K),XR(k)
  • Tries
    • Try
      • Q(K);XS(h)
      • Threat
        • DUALS(4)
      • Refutation
        • B(l);CHECK,XQ(K)
    • Try
      • Q(K);
      • Threat
        • DUALS(4)
      • Refutation
        • P(j);
  • Actual
    • S(H);XP(e)
    • Threat
      • R(D)+S(H)
    • Vars
      • R(k);CHECK,SBLOCK::R(D)+S(H)
      • K(f);P-FLIGHT::S(H),XP(d)
      • B(m);N_GUARD,P_SPINB(m),XP(G)::QAR(K),XR(k)
      • S(h);OGATE,XP(E)::QAR1(K)
      • S(h);OGATE,P_SPINS(h),XP(G)::QAR1(K)
      • S(h);OGATE::QAR1(K)
HTML5 logo

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).