MESON Chess Problem Database

Problem Display
PID: 6342 (1b2Nq2/3R1n1Q/3P1P1p/RB1kpnN1/PP5p/1b1P4/8/K5B1 w - - 0 1)

Nietvelt, Gustaaf Josephus

3rd Prize, Sports Referee, 1928

1b2Nq2/3R1n1Q/3P1P1p/RB1kpnN1/PP5p/1b1P4/8/K5B1

#2

13 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd6
      • 2.Qxf7#
    • 1...Qh8
      • 2.Qxf7#
    • 1...Bxa4
      • 2.Bxa4#
    • 1...Bc4
      • 2.dxc4#
    • 1...Bxd6
      • 2.Sc7#
    • 1...Ba7
      • 2.Sc7#
    • 1...Bc7
      • 2.Sxc7#
    • 1...Se3
      • 2.Qe4#
    • 1...Sd4
      • 2.Qe4#
    • 1...S5xd6
      • 2.Qe4#
    • 1...Se7
      • 2.Qe4#
    • 1...Sg7
      • 2.Qe4#
  • Keys
    • 1.Rd8!
      • threat
        • 2.Bd7#
      • 1...Qxd6
        • 2.Qxf7#
      • 1...Qxe8
        • 2.Bxe8#
      • 1...Bxa4
        • 2.Bxa4#
      • 1...Bxd6
        • 2.Sc7#
      • 1...S5xd6
        • 2.Qe4#
      • 1...S7xd6
        • 2.Qb7#
      • 1...Se3
        • 2.Qe4#
      • 1...Bc4
        • 2.dxc4#
      • 1...Ba7
        • 2.Sc7#
      • 1...Bc7
        • 2.Sxc7#
      • 1...Sd4
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • Q(i);N_GUARD,P_SPINQ(i),XP(I)::QAB(L),XS(g)
    • Q(i);N_GUARD::QAB(L),XS(g)
    • B(a);OGATE,XP(D)::R(F)+B(G),XB(a)
    • B(a);OGATE::P(C),XB(a)
    • B(h);N_GUARD,P_SPINB(h),XP(I)::S(M)
    • B(h);N_GUARD::S(M)
    • B(h);N_GUARD::S(M),XB(h)
    • S(e);OGATE::QAB1(L)
    • S(e);OGATE,P_SPINS(e),XP(I)::QAB1(L)
  • Actual
    • R(K);
    • Threat
      • R(F)+B(G)
    • Vars
      • Q(i);N_GUARD,P_SPINQ(i),XP(I)::QAB(L),XS(g)
      • Q(i);OGATE,XS(M)::R(F)+B(G),XQ(i)
      • B(a);OGATE,XP(D)::R(F)+B(G),XB(a)
      • B(h);N_GUARD,P_SPINB(h),XP(I)::S(M)
      • S(e);OGATE,P_SPINS(e),XP(I)::QAB1(L)
      • S(g);OGATE,P_SPINS(g),XP(I)::QAB(L)
      • S(e);OGATE::QAB1(L)
      • B(a);OGATE::P(C),XB(a)
      • B(h);N_GUARD::S(M)
      • B(h);N_GUARD::S(M),XB(h)
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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).