MESON Chess Problem Database

Problem Display
PID: 201524 (K7/1N4B1/2n5/4b3/2pn4/Pbk2q1R/P2pP2p/1Q6 w - - 0 1)

Somma, Francesco

L'Alfiere di Re, 1922

K7/1N4B1/2n5/4b3/2pn4/Pbk2q1R/P2pP2p/1Q6

#2

8 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qe3
      • 2.Rxe3#
    • 1...Bc2
      • 2.Qa1#
    • 1...Bd6
      • 2.Rxf3#
    • 1...Bc7
      • 2.Rxf3#
    • 1...Bb8
      • 2.Rxf3#
  • Keys
    • 1.Sd6!
      • threat
        • 2.Se4#
      • 1...Bxd6
        • 2.Rxf3#
      • 1...Sxe2
        • 2.Sb5#
      • 1...Sc2
        • 2.Sb5#
      • 1...Sb5
        • 2.Sxb5#
      • 1...Sf5
        • 2.Sb5#
      • 1...Se6
        • 2.Sb5#
      • 1...Bc2
        • 2.Qa1#
      • 1...Bg3
        • 2.Sb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 3
  • Sets
    • Q(e);OGATE::R(E),XQ(e)
    • B(c);SBLOCK::QAB(A)
    • B(h);P_SPINS(g)::R(E),XQ(e)
  • Actual
    • S(F);
    • Threat
      • S(F)
    • Vars
      • B(h);P_SPINS(g),XS(F)::R(E),XQ(e)
      • S(g);N_GUARD,P_SPINB(h),XP(C)::S(F)
      • S(g);N_GUARD,P_SPINB(h)::S(F)
      • S(g);N_GUARD,P_SPINB(h)::S(F),XS(g)
      • B(c);SBLOCK::QAB(A)
      • B(h);N_SPINQ(e),P_SPINS(g)::S(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).