MESON Chess Problem Database

Problem Display
PID: 78290 (3B4/p7/k2N4/p2p1r2/4b3/1B6/8/KQ6 w - - 0 1)

Cheylan, Yves

3rd HM., L'Italia Scacchistica, 1974

3B4/p7/k2N4/p2p1r2/4b3/1B6/8/KQ6

#2

5 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Bh1
      • 2.Qd3#
    • 1...Bg2
      • 2.Qd3#
    • 1...Bd3
      • 2.Qxd3#
    • 1...Bf3
      • 2.Qd3#
  • Tries
    • 1.Ba4?
      • threat
        • 2.Bb5#
        • 2.Qb5#
        • 2.Qb7#
      • 1...Bxb1
        • 2.Bb5#
      • 1...Rf1
        • 2.Bb5#
      • 1...Rf7
        • 2.Bb5#
        • 2.Qb5#
      • 1...Bd3
        • 2.Qxd3#
        • 2.Qb7#
      • 1...d4!
    • 1.Qf1+?
      • 1...Bd3
        • 2.Qxd3#
      • 1...Rxf1+!
  • Keys
    • 1.Bxd5!
      • threat
        • 2.Qb5#
        • 2.Qb7#
      • 1...Rxd5
        • 2.Qb7#
      • 1...Bxb1
        • 2.Bb7#
      • 1...Bxd5
        • 2.Qb5#
      • 1...Rf1
        • 2.Bc4#
      • 1...Rf7
        • 2.Bc4#
        • 2.Qb5#
      • 1...Bd3
        • 2.Bb7#
        • 2.Qxd3#
        • 2.Qb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • B(a);N_GUARD::QAB(B)
    • B(a);N_GUARD::QAB(B),XB(a)
  • Tries
    • Try
      • B(C);
      • Threat
        • DUALS(3)
      • Vars
        • B(a);XQ(B)::B(C)
        • R(d);P_PINQ(B)::B(C)
      • Refutation
        • P(c);
    • Try
      • Q(B);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAB(B),XB(a)
      • Refutation
        • R(d);CHECK,XQ(B)
  • Actual
    • B(C);XP(c)
    • Threat
      • DUALS(2)
    • Vars
      • R(d);XB(C)::QAB1(B)
      • B(a);N_GUARD,XQ(B)::B(C)
      • B(a);XB(C)::QAB1(B)
      • R(d);N_GUARD,P_PINQ(B)::B(C)
HTML5 logo

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).