MESON Chess Problem Database

Problem Display
PID: 201369 (2n1R2n/2N1P1BK/1P4p1/p2P4/Qq2k1P1/3pPp1B/8/5N2 w - - 0 1)

Belli, Nicolo

L'Alfiere di Re, 1922

2n1R2n/2N1P1BK/1P4p1/p2P4/Qq2k1P1/3pPp1B/8/5N2

#2

12 + 8

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qc4
      • 2.Qxc4#
    • 1...Qd4
      • 2.Qxd4#
    • 1...Sxe7
      • 2.Rxe7#
    • 1...d2
      • 2.Qc2#
    • 1...f2
      • 2.Bg2#
  • Keys
    • 1.Bd4!
      • threat
        • 2.Sg3#
      • 1...Qxe7+
        • 2.Bg7#
      • 1...Qxd4
        • 2.Qxd4#
      • 1...d2
        • 2.Qc2#
      • 1...f2
        • 2.Bg2#
      • 1...Qe1
        • 2.Bc3#
      • 1...Qd6
        • 2.Sd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(c);OGATE::QAR2(D),XQ(c)
    • Q(c);OGATE::QAR1(D),XQ(c)
    • S(g);OGATE,P_SPINS(g),XP(I)::R(L),XS(g)
    • P(a);OGATEB::QAB(D)
    • P(b);OGATEB::B(C)
  • Actual
    • B(J);N_PINQ(c)
    • Threat
      • S(A)
    • Vars
      • Q(c);CHECK,OGATEB,P_SPINQ(c),XP(I)::QAR(D)+B(J)
      • Q(c);OGATE,P_SPINQ(c),XB(J)::QAR1(D),XQ(c)
      • P(a);OGATEB::QAB(D)
      • P(b);OGATEB::B(C)
      • Q(c);OGATEB::QAR(D)+B(J)
      • Q(c);N_GUARD::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).