MESON Chess Problem Database

Problem Display
PID: 228889 (3bQ1b1/2p1r1pp/K7/1RP1k1P1/3N2P1/4P2p/6Bq/7n w - - 0 1)

Cristoffanini, Guido

Bristol Times and Mirror, 1926

3bQ1b1/2p1r1pp/K7/1RP1k1P1/3N2P1/4P2p/6Bq/7n

#2

9 + 10

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Re6+
      • 2.Sc6#
    • 1...Be6
      • 2.Sc6#
  • Tries
    • 1.Qd7?
      • threat
        • 2.Sc6#
        • 2.Qf5#
      • 1...Re6+
        • 2.c6#
      • 1...Qxg2
        • 2.Qf5#
      • 1...hxg2
        • 2.Qf5#
      • 1...Qf4
        • 2.Sc6#
      • 1...Rf7
        • 2.Sc6#
        • 2.Qe6#
        • 2.Qd5#
        • 2.c6#
      • 1...Bd5
        • 2.Qf5#
        • 2.Qxd5#
      • 1...Be6
        • 2.Sc6#
      • 1...Sg3
        • 2.Sc6#
      • 1...c6
        • 2.Sxc6#
        • 2.Qf5#
        • 2.Qd6#
      • 1...g6
        • 2.Sc6#
      • 1...Rxd7!
    • 1.Qxe7+?
      • 1...Be6
        • 2.Sc6#
        • 2.Qxe6#
        • 2.c6#
      • 1...Bxe7!
    • 1.c6+?
      • 1...Bd5
        • 2.Rxd5#
      • 1...Kd6!
  • Keys
    • 1.Qf8!
      • threat
        • 2.Qf5#
      • 1...Re6+
        • 2.c6#
      • 1...Qf4
        • 2.Qxf4#
      • 1...Rf7
        • 2.c6#
      • 1...Be6
        • 2.Sc6#
      • 1...Bf7
        • 2.Qxg7#
      • 1...Sg3
        • 2.Qf4#
      • 1...g6
        • 2.Qf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • R(f);CHECK::S(C)
    • B(j);N_SPINR(f),SBLOCK::S(C)
  • Tries
    • Try
      • Q(I);N_PINR(f)
      • Threat
        • DUALS(2)
      • Vars
        • R(f);CHECK,S_CUTB(j)::R(E)+P(F)
        • Q(b);XB(A)::QAR1(I)
        • P(c);XB(A)::QAR1(I)
        • Q(b);::S(C)
        • B(j);::S(C)
        • S(a);::S(C)
        • P(g);::S(C)
      • Refutation
        • R(f);XQ(I)
    • Try
      • Q(I);CHECK,XR(f)
      • Refutation
        • B(i);XQ(I)
    • Try
      • P(F);CHECK
      • Vars
        • B(j);N_GUARD,P_SPINB(j)::R1(E),XB(j)
      • Refutation
        • K(d);N_SPINR(f),S_FLIGHT
  • Actual
    • Q(I);N_PINR(f)
    • Threat
      • QAR1(I)
    • Vars
      • R(f);CHECK,S_CUTB(j)::R(E)+P(F)
      • Q(b);N_GUARD::QAB1(I),XQ(b)
      • R(f);S_CUTB(j)::R(E)+P(F)
      • B(j);SBLOCK::S(C)
      • B(j);S_CUTR(f)::QAB(I),XP(g)
      • S(a);S_CUTQ(b)::QAB1(I)
      • P(g);N_GUARD::QAB1(I)
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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).