MESON Chess Problem Database

Problem Display
PID: 138550 (1b2r1r1/3pp2b/KQ3n1q/3pp3/N1P2P2/1R6/p4P2/k4B1R w - - 0 1)

Niemeijer, Meindert

Skakbladet, 1966

1b2r1r1/3pp2b/KQ3n1q/3pp3/N1P2P2/1R6/p4P2/k4B1R

#2

9 + 12

6490 yacpdb 2011

SOLUTION

  • SOUND
  • Sets
    • 1...exf4
      • 2.Qd4#
    • 1...e4
      • 2.Qd4#
  • Tries
    • 1.Bd3+?
      • 1...Rg1
        • 2.Rxg1#
      • 1...Qxh1!
    • 1.Rg3?
      • threat
        • 2.Qb2#
      • 1...Se4
        • 2.Bh3#
      • 1...Sh5
        • 2.Bd3#
      • 1...Sg4!
    • 1.Rbh3?
      • threat
        • 2.Qb2#
      • 1...Sg4
        • 2.Bd3#
      • 1...Se4
        • 2.Bg2#
      • 1...Sh5!
  • Keys
    • 1.Rd3!
      • threat
        • 2.Qb2#
      • 1...Se4
        • 2.Rd1#
      • 1...Sg4
        • 2.Bh3#
      • 1...Sh5
        • 2.Bg2#

This is a version

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • P(d);N_GUARD,XP(G)::QAB(I)
    • P(d);N_GUARD::QAB(I)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • R(l);N_GUARD,P_SPINR(l)::R(B),XR(l)
      • Refutation
        • Q(f);XR(B)
    • Try
      • R(D);
      • Threat
        • QAB1(I)
      • Vars
        • S(e);P_PINQ(I),S_CUTB(i)::R(B)+B(A)
        • S(e);P_PINQ(I),S_CUTQ(f)::R(B)+B(A)
      • Refutation
        • S(e);P_PINQ(I)
    • Try
      • R(D);
      • Threat
        • QAB1(I)
      • Vars
        • S(e);P_PINQ(I),S_CUTR(l)::R(B)+B(A)
        • S(e);P_PINQ(I),S_CUTB(i)::R(B)+B(A)
      • Refutation
        • S(e);P_PINQ(I)
  • Actual
    • R(D);
    • Threat
      • QAB1(I)
    • Vars
      • S(e);P_PINQ(I),S_CUTB(i)::R(D)
      • S(e);P_PINQ(I),S_CUTR(l)::R(B)+B(A)
      • S(e);P_PINQ(I),S_CUTQ(f)::R(B)+B(A)
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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).