MESON Chess Problem Database

Problem Display
PID: 268318 (1B1NRq2/r1r1Np1B/1R3b2/p3k3/2b2p2/1pKp4/1Q1P4/8 w - - 0 1)

Cristoffanini, Guido

Scacco!, 1974

1B1NRq2/r1r1Np1B/1R3b2/p3k3/2b2p2/1pKp4/1Q1P4/8

#2

9 + 11

15601 Albrecht-Leiss-Degener Collection 2023
5454 Near Snap 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Ra6
      • 2.Bxc7#
    • 1...Ra8
      • 2.Bxc7#
    • 1...Bb5+
      • 2.Kxb3#
    • 1...Bd5+
      • 2.Kxd3#
    • 1...Ba6+
      • 2.Kxb3#
    • 1...Be6+
      • 2.Kxd3#
    • 1...a4
      • 2.Kb4#
  • Tries
    • 1.Sxf7+?
      • 1...Bxf7+
        • 2.Kxd3#
      • 1...Qxf7!
    • 1.Rc6?
      • threat
        • 2.Kxc4#
      • 1...Bb5
        • 2.Kxb3#
      • 1...Bd5
        • 2.Kxd3#
      • 1...Ba6
        • 2.Kxb3#
      • 1...Be6
        • 2.Kxd3#
      • 1...f3!
  • Keys
    • 1.Qa3!
      • threat
        • 2.Qd6#
      • 1...Bb5+
        • 2.Qc5#
      • 1...Bd5+
        • 2.Sec6#
      • 1...Ba6+
        • 2.Qc5#
      • 1...Be6+
        • 2.Sdc6#

Anticipated by 6754(1933)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 0
    • REMOVED MATES = 3
  • Sets
    • R(h);N_GUARD::B(G),XR(i)
    • B(c);CHECK::QAB(A)+K(C),XP(a)
    • B(c);CHECK::QAB(A)+K(C),XP(b)
    • P(e);::QAB(A)+K(C)
  • Tries
    • Try
      • S(H);CHECK,XP(j)
      • Vars
        • B(c);CHECK,XS(H)::QAB(A)+K(C),XP(b)
      • Refutation
        • Q(k);XS(H)
    • Try
      • R(D);
      • Threat
        • QAB(A)+K(C),XB(c)
      • Vars
        • B(c);P_PINR(D)::QAB(A)+K(C),XP(a)
        • B(c);P_PINR(D)::QAB(A)+K(C),XP(b)
      • Refutation
        • P(d);
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • B(c);CHECK,N_GUARD::QAR2(A)
      • B(c);CHECK,SBLOCK::R(I)+S(E),DCHECK
      • B(c);CHECK,SBLOCK::S(H)
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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).