MESON Chess Problem Database

Problem Display
PID: 264253 (4bQ2/1R4p1/R1n1k1p1/p6p/2K1p1n1/2B4B/8/2b2r2 w - - 0 1)

ten Cate, Pieter

Prace, 1965

4bQ2/1R4p1/R1n1k1p1/p6p/2K1p1n1/2B4B/8/2b2r2

#2

6 + 11

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rf5
      • 2.Qe7#
  • Tries
    • 1.Bxg4+?
      • 1...Rf5
        • 2.Qe7#
      • 1...hxg4!
    • 1.Qc5?
      • threat
        • 2.Re7#
        • 2.Qd5#
        • 2.Qe5#
      • 1...Rd1
        • 2.Re7#
        • 2.Qe5#
      • 1...Rf5
        • 2.Re7#
        • 2.Qe7#
      • 1...Rf7
        • 2.Qd5#
        • 2.Qe5#
      • 1...Bf4
        • 2.Re7#
        • 2.Qd5#
      • 1...Bg5
        • 2.Qd5#
        • 2.Qe5#
      • 1...Bd7!
    • 1.Qxe8+?
      • 1...Kd6
        • 2.Rxc6#
        • 2.Rd7#
        • 2.Qxc6#
        • 2.Qd7#
        • 2.Qe7#
      • 1...Kf5!
  • Keys
    • 1.Qxg7!
      • threat
        • 2.Qe5#
      • 1...Kf5
        • 2.Qf6#
      • 1...Kd6
        • 2.Qe7#
      • 1...Rf5
        • 2.Qe7#
      • 1...Rf6
        • 2.Qxf6#
      • 1...Bf4
        • 2.Qf6#
      • 1...Bd7
        • 2.Qxd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • R(b);N_SPINS(d),P_SPINS(g),SBLOCK::QAR1(F)
  • Tries
    • Try
      • B(B);CHECK,P_PINS(g),XS(d)
      • Vars
        • R(b);P_SPINR(b)::QAR1(F)
      • Refutation
        • P(f);XB(B)
    • Try
      • Q(F);
      • Threat
        • DUALS(3)
      • Refutation
        • B(k);
    • Try
      • Q(F);CHECK,XB(k)
      • Refutation
        • K(h);S_FLIGHT
  • Actual
    • Q(F);XP(j)
    • Threat
      • QAR1(F)
    • Vars
      • K(h);S_CUTR(b),S_FLIGHT::QAR1(F)
      • K(h);N_GUARD,N_SPINS(d),P-FLIGHT,P_SPINS(g)::QAB1(F)
      • R(b);N_SPINS(d),P_SPINS(g),SBLOCK::QAR1(F)
      • R(b);N_GUARD::QAR1(F),XR(b)
      • B(a);S_CUTR(b)::QAR1(F)
      • B(k);N_GUARD::QAB1(F),XB(k)
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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).