MESON Chess Problem Database

Problem Display
PID: 263988 (bb1R4/6p1/1p6/3q1Q1p/3k3r/BR3P1p/KP2BP2/8 w - - 0 1)

Eerkes, Allard Pieter

1st Prize, Tijdschrift vd KNSB, 1939

bb1R4/6p1/1p6/3q1Q1p/3k3r/BR3P1p/KP2BP2/8

#2

9 + 9

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qd6
      • 2.Rb4#
    • 1...Qd7
      • 2.Rb4#
    • 1...Qxd8
      • 2.Rb4#
    • 1...Re4
      • 2.Qxe4#
    • 1...Bf4
      • 2.Qe4#
    • 1...Be5
      • 2.Qd3#
  • Tries
    • 1.Qf6+?
      • 1...Be5
        • 2.Qxb6#
      • 1...gxf6!
  • Keys
    • 1.Qe6!
      • threat
        • 2.Qe3#
      • 1...Qxd8
        • 2.Rd3#
      • 1...Qd6
        • 2.Rd3#
      • 1...Qd7
        • 2.Rd3#
      • 1...Re4
        • 2.Qxe4#
      • 1...Bf4
        • 2.Qe4#
      • 1...Be5
        • 2.Qxb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • Q(d);N_PINR(F)::R(F)
    • Q(d);N_PINR(F),N_SPINQ(d),XR(I)::R(F)
    • R(c);N_GUARD::QAR1(H),XR(c)
    • B(i);S_CUTR(c)::QAR1(H)
    • B(i);SBLOCK::QAR1(H)
  • Tries
    • Try
      • Q(H);CHECK
      • Vars
        • B(i);P_SPINB(i),SBLOCK::QAB(H),XP(f)
      • Refutation
        • P(g);XQ(H)
  • Actual
    • Q(H);
    • Threat
      • QAB1(H)
    • Vars
      • Q(d);N_PINR(F),N_SPINQ(d),XR(I)::R1(F)
      • Q(d);N_PINR(F)::R1(F)
      • R(c);N_GUARD::QAR1(H),XR(c)
      • B(i);S_CUTR(c)::QAR1(H)
      • B(i);SBLOCK::QAB(H),XP(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).