MESON Chess Problem Database

Problem Display
PID: 11661 (2bqr3/2r5/2p3B1/1N3nPp/1nP1k3/R3BN2/p2P2K1/Q7 w - - 0 1)

Niemeijer, Meindert

Schakend Nederland, 1970

2bqr3/2r5/2p3B1/1N3nPp/1nP1k3/R3BN2/p2P2K1/Q7

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg5+
      • 2.Sxg5#
    • 1...Qe7
      • 2.Qd4#
    • 1...Qxd2+
      • 2.Sxd2#
    • 1...Qd4
      • 2.Qxd4#
    • 1...Qd6
      • 2.Sxd6#
    • 1...Re5
      • 2.Qxe5#
    • 1...Rf8
      • 2.Qe5#
    • 1...Rg8
      • 2.Qe5#
    • 1...Rh8
      • 2.Qe5#
    • 1...Be6
      • 2.Qe5#
    • 1...Bd7
      • 2.Sd6#
      • 2.Qd4#
    • 1...Sd3
      • 2.Sc3#
    • 1...Sd5
      • 2.Qd4#
  • Tries
    • 1.d4?
      • threat
        • 2.Sd2#
      • 1...Qxg5+
        • 2.Sxg5#
      • 1...Qxd4
        • 2.Qxd4#
      • 1...Sd3!
  • Keys
    • 1.Qe1!
      • threat
        • 2.Qh4#
      • 1...Qxg5+
        • 2.Bxg5#
      • 1...Qxd2+
        • 2.Bxd2#
      • 1...Qd6
        • 2.Sxd6#
      • 1...Sd3
        • 2.Sc3#
      • 1...Sd5
        • 2.d3#
      • 1...h4
        • 2.Qxh4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • Q(i);CHECK,XP(I)::S(F),XQ(i)
    • Q(i);N_GUARD::QAR1(A)
    • Q(i);CHECK,XP(B)::S(F),XQ(i)
    • Q(i);N_GUARD::QAR1(A),XQ(i)
    • Q(i);N_GUARD::S(H),XQ(i)
    • R(j);N_GUARD::QAR1(A),XR(j)
    • R(j);N_GUARD::QAR1(A)
    • B(h);S_CUTR(j)::QAR1(A)
    • S(b);SBLOCK::S(H)
    • S(b);S_CUTQ(i)::QAR1(A)
  • Tries
    • Try
      • P(B);
      • Threat
        • S(F)
      • Vars
        • Q(i);CHECK,XP(I)::S(F),XQ(i)
        • Q(i);OGATE,XP(B)::QAR1(A),XQ(i)
      • Refutation
        • S(b);
  • Actual
    • Q(A);
    • Threat
      • QAR(A)
    • Vars
      • Q(i);CHECK,OGATE,XP(I)::QAR(A)+B(E),XQ(i)
      • Q(i);CHECK,OGATE,XP(B)::QAR(A)+B(E),XQ(i)
      • Q(i);N_GUARD::S(H),XQ(i)
      • S(b);SBLOCK::S(H)
      • S(b);N_GUARD,S_CUTQ(i)::P(B)
      • P(e);::QAR(A),XP(e)
HTML5 logo

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).