MESON Chess Problem Database

Problem Display
PID: 227523 (8/p2p3R/4k1n1/Q5pN/4p1p1/1q6/B1N5/B2K4 w - - 0 1)

Cristoffanini, Guido

L'Echiquier, 1926

8/p2p3R/4k1n1/Q5pN/4p1p1/1q6/B1N5/B2K4

#2

7 + 8

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5+
      • 2.Qxd5#
    • 1...Sf4
      • 2.Qe5#
    • 1...Sh4
      • 2.Qe5#
    • 1...Se5
      • 2.Qxe5#
    • 1...Se7
      • 2.Qe5#
    • 1...Sf8
      • 2.Qe5#
    • 1...Sh8
      • 2.Qe5#
  • Tries
    • 1.Bxb3+?
      • 1...d5
        • 2.Qxd5#
      • 1...Kd6!
  • Keys
    • 1.Qc7!
      • threat
        • 2.Qxd7#
      • 1...Qd5+
        • 2.Sd4#
      • 1...Kd5
        • 2.Bxb3#
      • 1...Kf5
        • 2.Sg7#
      • 1...Se5
        • 2.Qxe5#
      • 1...Se7
        • 2.Qe5#
      • 1...Sf8
        • 2.Qe5#
      • 1...d5
        • 2.Sg7#
        • 2.Qd7#
      • 1...d6
        • 2.Qf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(a);CHECK,N_GUARD,N_PINS(D)::QAB1(E),XQ(a)
    • S(f);N_GUARD::QAR1(E)
    • S(f);N_GUARD::QAR1(E),XS(f)
  • Tries
    • Try
      • B(C);CHECK,N_SPINS(D),XQ(a)
      • Vars
        • P(h);P_SPINP(h)::QAB1(E),XP(h)
      • Refutation
        • K(e);P-FLIGHT
  • Actual
    • Q(E);
    • Threat
      • QAB1(E),XP(h)
    • Vars
      • Q(a);CHECK,N_PINS(D)::S(D)
      • K(e);S_FLIGHT::B(C),XQ(a)
      • K(e);N_SPINQ(a),S_FLIGHT::S(F)
      • S(f);N_GUARD::QAR1(E),XS(f)
      • S(f);N_GUARD::QAR1(E)
      • P(h);OGATE,SBLOCK::QAB1(E)
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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).