MESON Chess Problem Database

Problem Display
PID: 149979 (8/2r1PNpK/4N1P1/1rRpqkB1/3R1pp1/1n2p3/6P1/3B4 w - - 0 1)

Calapso, Remo

L'Alfiere di Re, 1923

8/2r1PNpK/4N1P1/1rRpqkB1/3R1pp1/1n2p3/6P1/3B4

#2

10 + 10

15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Qd6
      • 2.Sxg7#
    • 1...Qe4
      • 2.Sxg7#
    • 1...Qxe6
      • 2.Rxf4#
  • Tries
    • 1.Bc2+?
      • 1...Qe4
        • 2.Sxg7#
      • 1...Kxe6!
  • Keys
    • 1.Re4!
      • threat
        • 2.Rxe5#
      • 1...Kxe4
        • 2.Bc2#
      • 1...Kxe6
        • 2.Bxg4#
      • 1...Qxe4
        • 2.Sxg7#
      • 1...Qxe6
        • 2.Rxf4#
      • 1...dxe4
        • 2.Sxg7#
      • 1...Qa1
        • 2.Sd6#
      • 1...Qb2
        • 2.Sd6#
      • 1...Qc3
        • 2.Sd6#
      • 1...Qd4
        • 2.Sd6#
      • 1...Qd6
        • 2.Sxd6#
      • 1...Qf6
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • Q(g);N_GUARD,P_SPINP(f)::S(F),XP(j)
    • Q(g);N_GUARD,P_SPINP(f),SBLOCK,XS(F)::R1(C),XP(c)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • Q(g);P_SPINP(f),P_SPINQ(g)::S(F),XP(j)
      • Refutation
        • K(h);S_FLIGHT,XS(F)
  • Actual
    • R(C);
    • Threat
      • R1(C),XQ(g)
    • Vars
      • K(h);OGATEB,S_FLIGHT,XR(C)::B(A)
      • K(h);P_SPINQ(g),S_FLIGHT,XS(F)::B(A),XP(d)
      • Q(g);N_GUARD,P_SPINP(f),SBLOCK,XR(C)::S(F),XP(j)
      • Q(g);N_GUARD,P_SPINP(f),SBLOCK,XS(F)::R1(C),XP(c)
      • P(f);P_SPINQ(g),SBLOCK,XR(C)::S(F),XP(j)
      • Q(g);N_GUARD,P_SPINP(f)::S(I)
      • Q(g);N_GUARD,P_SPINP(f)::S(I),XQ(g)
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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).