MESON Chess Problem Database

Problem Display
PID: 6555 (4R2Q/6n1/2K1N3/R4pB1/3Nkn2/8/3pPr1b/8 w - - 0 1)

Cristoffanini, Guido

Prize, Schackvarlden, 1931/I

4R2Q/6n1/2K1N3/R4pB1/3Nkn2/8/3pPr1b/8

#2

8 + 7

5862 An ABC of Chess Problems 1970

SOLUTION

  • SOUND
  • Sets
    • 1...Ke3
      • 2.Re5#
    • 1...Sh5
      • 2.Sxf4#
      • 2.Sc5#
      • 2.Re5#
      • 2.Qe5#
    • 1...Sxe6
      • 2.Qe5#
    • 1...Sxe8
      • 2.Re5#
      • 2.Qe5#
  • Tries
    • 1.Sxf4+?
      • 1...Se6
        • 2.Rxe6#
        • 2.Qe5#
      • 1...Sxe8
        • 2.Qe5#
      • 1...Kxd4!
    • 1.Qxg7?
      • threat
        • 2.Sxf4#
        • 2.Sc5#
        • 2.Re5#
        • 2.Qe5#
      • 1...Ke3
        • 2.Sxf4#
        • 2.Sc5#
        • 2.Sc7#
        • 2.Sd8#
        • 2.Sf8#
        • 2.Re5#
        • 2.Qe5#
      • 1...Rxe2
        • 2.Sxf4#
        • 2.Sc5#
      • 1...Sxe2
        • 2.Sf4#
        • 2.Sc5#
      • 1...Sg2
        • 2.Sf4#
        • 2.Sc5#
      • 1...Sd3
        • 2.Sc5#
      • 1...Sh3
        • 2.Sf4#
        • 2.Sc5#
      • 1...Sd5
        • 2.Sc5#
      • 1...Sh5
        • 2.Sf4#
        • 2.Sc5#
      • 1...Sg6
        • 2.Sc5#
      • 1...Sxe6!
  • Keys
    • 1.Ra4!
      • threat
        • 2.Sc5#
      • 1...Ke3
        • 2.Sxg7#
      • 1...Ke5
        • 2.Sxf4#
      • 1...Sfxe6
        • 2.Sf3#
      • 1...Sgxe6
        • 2.Sc2#
      • 1...Sxe8
        • 2.Sc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(d);P-FLIGHT,P_SPINS(e)::R(C)
    • S(g);OGATE,P_SPINS(g),XS(F)::QAR1(H)
  • Tries
    • Try
      • S(F);CHECK,XS(e)
      • Vars
        • S(g);OGATE,XR(G)::QAR1(H)
      • Refutation
        • K(d);P-FLIGHT,P_SPINS(g),XS(B)
    • Try
      • Q(H);XS(g)
      • Threat
        • DUALS(4)
      • Vars
        • S(e);::R(G)+S(F),DCHECK
      • Refutation
        • S(e);P_SPINS(e),XS(F)
  • Actual
    • R(C);
    • Threat
      • R(G)+S(F),DCHECK
    • Vars
      • K(d);P-FLIGHT,P_SPINS(e)::R(G)+S(F),XS(g)
      • K(d);P-FLIGHT,P_SPINS(g)::R(G)+S(F),XS(e)
      • S(e);P_SPINS(e),XS(F)::R(C)+S(B)
      • S(g);P_SPINS(g),XS(F)::R(C)+S(B)
      • S(g);XR(G)::R(C)+S(B)
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).