MESON Chess Problem Database

Problem Display
PID: 254425 (8/R2n1B2/1pp5/1Pp2p2/1Rn1k1pb/r2NP3/b1P1PP2/Q2NK3 w - - 0 1)

den Toom, Bas

Probleemblad, 1983

8/R2n1B2/1pp5/1Pp2p2/1Rn1k1pb/r2NP3/b1P1PP2/Q2NK3

#2

12 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Rb3
      • 2.Rxc4#
    • 1...Rc3
      • 2.Sxc3#
    • 1...Rxd3
      • 2.cxd3#
    • 1...Ra4
      • 2.Sc3#
    • 1...Ra5
      • 2.Sc3#
    • 1...Ra6
      • 2.Sc3#
    • 1...Rxa7
      • 2.Sc3#
    • 1...Bb1
      • 2.Rxc4#
    • 1...Bb3
      • 2.Sc3#
    • 1...Bxf2+
      • 2.S3xf2#
    • 1...Se5
      • 2.Qxe5#
    • 1...Sf6
      • 2.Re7#
      • 2.Qe5#
    • 1...Sb8
      • 2.Qe5#
    • 1...Sf8
      • 2.Qe5#
    • 1...g3
      • 2.f3#
    • 1...cxb4
      • 2.Qd4#
  • Tries
    • 1.Sxc5+?
      • 1...Sxc5
        • 2.Qd4#
      • 1...bxc5!
    • 1.Qf6?
      • threat
        • 2.Qxc6#
      • 1...Bxf2+
        • 2.S3xf2#
      • 1...Rxd3
        • 2.cxd3#
      • 1...Sxf6
        • 2.Re7#
      • 1...cxb5
        • 2.Qc6#
      • 1...Se5
        • 2.Qxe5#
      • 1...Sb8
        • 2.Re7#
        • 2.Qe5#
        • 2.Qe6#
      • 1...f4
        • 2.Qxf4#
        • 2.Qg6#
      • 1...Bxf6!
  • Keys
    • 1.Qh8!
      • 1...Bxf2+
        • 2.S3xf2#
      • 1...Rxd3
        • 2.cxd3#
      • 1...Rxa7
        • 2.Sc3#
      • 1...cxb4
        • 2.Qd4#
      • 1...cxb5
        • 2.Qa8#
      • 1...f4
        • 2.Qh7#
      • 1...Bg3
        • 2.Qh1#
      • 1...Rb3
        • 2.Rxc4#
      • 1...Rc3
        • 2.Sxc3#
      • 1...Ra4
        • 2.Sc3#
      • 1...Ra5
        • 2.Sc3#
      • 1...Ra6
        • 2.Sc3#
      • 1...Bb1
        • 2.Rxc4#
      • 1...Bb3
        • 2.Sc3#
      • 1...Bg5
        • 2.Qh1#
      • 1...Bf6
        • 2.Qh1#
      • 1...Be7
        • 2.Qh1#
      • 1...Bd8
        • 2.Qh1#
      • 1...Se5
        • 2.Qxe5#
      • 1...Sf6
        • 2.Re7#
      • 1...Sb8
        • 2.Qe5#
      • 1...Sf8
        • 2.Qe5#
      • 1...g3
        • 2.f3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • R(b);S_CUTB(a)::R(I),XS(c)
    • R(b);N_GUARD::S(B),XR(b)
    • R(b);OGATE,XS(G)::P(D),XR(b)
    • R(b);N_GUARD::S(B)
    • R(b);N_GUARD,XR(K)::S(B)
    • B(a);N_GUARD::R(I),XS(c)
    • B(a);S_CUTR(b)::S(B)
    • B(f);CHECK,XP(F)::S(G),XB(f)
    • S(k);N_GUARD::QAR1(A),XS(k)
    • S(k);N_GUARD::QAR1(A)
    • P(e);N_PINP(F)::P(F)
    • P(g);N_GUARD,N_SPINS(c),XR(I)::QAR1(A)
  • Tries
    • Try
      • S(G);CHECK,XP(g)
      • Vars
        • S(k);XS(G)::QAR1(A)
      • Refutation
        • P(i);XS(G)
    • Try
      • Q(A);
      • Threat
        • QAB(A),XP(j)
      • Vars
        • B(f);CHECK,XP(F)::S(G),XB(f)
        • R(b);OGATE,XS(G)::P(D),XR(b)
        • S(k);OGATE,XQ(A)::R(K)
        • P(j);XP(J)::QAB(A)
        • S(k);N_GUARD::QAR1(A),XS(k)
      • Refutation
        • B(f);N_PINP(F),XQ(A)
  • Actual
    • Q(A);
    • Vars
      • B(f);CHECK,XP(F)::S(G),XB(f)
      • R(b);OGATE,XS(G)::P(D),XR(b)
      • R(b);N_GUARD,XR(K)::S(B)
      • P(g);N_GUARD,N_SPINS(c),XR(I)::QAR1(A)
      • P(j);OGATEB,XP(J)::QAB(A)
      • P(h);OGATEB::QAB(A)
      • B(f);OGATE::QAB(A)
      • R(b);S_CUTB(a)::R(I),XS(c)
      • R(b);N_GUARD::S(B),XR(b)
      • R(b);N_GUARD::S(B)
      • B(a);N_GUARD::R(I),XS(c)
      • B(a);S_CUTR(b)::S(B)
      • B(f);N_PINP(F),OGATE::QAB(A)
      • S(k);N_GUARD::QAR1(A),XS(k)
      • S(k);OGATE::R(K)
      • S(k);N_GUARD::QAR1(A)
      • P(e);N_PINP(F)::P(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).