MESON Chess Problem Database

Problem Display
PID: 250156 (4q3/4B1p1/2PNk1NR/5p2/4BP1n/7Q/b5P1/3K4 w - - 0 1)

van Dijk, Johannes

Der Tijd, 1927

4q3/4B1p1/2PNk1NR/5p2/4BP1n/7Q/b5P1/3K4

#2

10 + 6

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe7
      • 2.Sf8#
    • 1...Bb1
      • 2.Qb3#
    • 1...Bb3+
      • 2.Qxb3#
    • 1...Sxg2
      • 2.Qxf5#
    • 1...Sf3
      • 2.Qxf5#
  • Tries
    • 1.Bxf5+?
      • 1...Sxf5
        • 2.Qxf5#
      • 1...Kd5!
  • Keys
    • 1.Qe3!
      • threat
        • 2.Bf3#
      • 1...Bb3+
        • 2.Qxb3#
      • 1...Qxc6
        • 2.Bxc6#
      • 1...Qxe7
        • 2.Sf8#
      • 1...Sxg2
        • 2.Bxg2#
      • 1...fxe4
        • 2.Qxe4#
      • 1...Bb1
        • 2.Qb3#
      • 1...Bd5
        • 2.Bxf5#
      • 1...Sf3
        • 2.Bxf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(f);SBLOCK,XB(J)::R(I)+S(H),DCHECK
    • B(a);N_GUARD::QAB(C)
    • B(a);CHECK,N_GUARD::QAB(C),XB(a)
    • S(b);N_GUARD,XP(B)::QAB1(C),XP(c)
    • S(b);N_GUARD::QAB1(C),XP(c)
  • Tries
    • Try
      • B(D);CHECK,XP(c)
      • Vars
        • S(b);OGATE,P_SPINS(b),XB(D)::QAB1(C),XS(b)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • Q(C);N_PINP(c)
    • Threat
      • QAR(C)+B(D)
    • Vars
      • B(a);CHECK,N_GUARD::QAB(C),XB(a)
      • Q(f);OGATE,XP(F)::QAR(C)+B(D),XQ(f)
      • Q(f);SBLOCK,XB(J)::R(I)+S(H),DCHECK
      • S(b);OGATE,XP(B)::QAR(C)+B(D),XS(b)
      • P(c);OGATE,P_SPINP(c),XB(D)::QAR2(C),XP(c)
      • B(a);N_GUARD::QAB(C)
      • B(a);SBLOCK::QAR(C)+B(D),DCHECK,XP(c)
      • S(b);::QAR(C)+B(D),XS(b)
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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).