MESON Chess Problem Database

Problem Display
PID: 202409 (1K6/8/2pN2RB/2p1k3/4n3/2NQ4/4nbb1/4R3 w - - 0 1)

van der Ven, AMA

2nd Prize, Good Companions, 1923

1K6/8/2pN2RB/2p1k3/4n3/2NQ4/4nbb1/4R3

#2

7 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bf1
      • 2.Qxe4#
    • 1...Bh3
      • 2.Qxe4#
    • 1...Sf4
      • 2.Bg7#
    • 1...Sd2
      • 2.Sf7#
    • 1...Sxc3
      • 2.Sc4#
      • 2.Sf7#
    • 1...Sg3
      • 2.Sc4#
      • 2.Sf7#
  • Tries
    • 1.Bg7+?
      • 1...Kf4
        • 2.Sxe2#
      • 1...Sf6!
  • Keys
    • 1.Qc4!
      • threat
        • 2.Re6#
      • 1...Sxd6
        • 2.Qf4#
      • 1...Sf6
        • 2.Bf4#
      • 1...Bh3
        • 2.Qxe4#
      • 1...Sd4
        • 2.Qxc5#
      • 1...Sf4
        • 2.Bg7#
      • 1...Sg5
        • 2.Bg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • B(c);N_GUARD::QAR1(C),XS(d)
    • S(a);P_SPINS(d),SBLOCK::B(F)
    • S(d);P_SPINS(a)::S(D)
  • Tries
    • Try
      • B(F);CHECK
      • Vars
        • K(f);S_FLIGHT::S(B),XS(a)
      • Refutation
        • S(d);P_SPINS(a)
  • Actual
    • Q(C);
    • Threat
      • R1(E)
    • Vars
      • S(d);OGATE,P_SPINS(a),XS(D)::QAB1(C)
      • S(d);P_SPINS(a)::B(F)
      • B(c);N_GUARD::QAR1(C),XS(d)
      • S(a);P_SPINS(d),S_CUTB(b)::QAR2(C),XP(e)
      • S(a);P_SPINS(d),SBLOCK::B(F)
      • S(d);N_GUARD,P_SPINS(a)::B(F)
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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).