MESON Chess Problem Database

Problem Display
PID: 257222 (3B4/1n1p4/3k4/Nppp1K2/2R5/8/8/1Q6 w - - 0 1)

Lancia, Ugo

Probleemblad, 1947

3B4/1n1p4/3k4/Nppp1K2/2R5/8/8/1Q6

#2

5 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...bxc4
      • 2.Qb6#
    • 1...dxc4
      • 2.Qd1#
  • Tries
    • 1.Qa1?
      • threat
        • 2.Qe5#
        • 2.Qf6#
      • 1...Sxa5
        • 2.Qf6#
      • 1...Sxd8
        • 2.Qe5#
      • 1...dxc4
        • 2.Qe5#
        • 2.Qd1#
      • 1...d4!
    • 1.Qe1?
      • threat
        • 2.Qg3#
        • 2.Qe5#
        • 2.Qe7#
      • 1...Sxd8
        • 2.Qe5#
      • 1...dxc4
        • 2.Qd2#
        • 2.Qd1#
        • 2.Qe5#
      • 1...d4
        • 2.Qe5#
      • 1...Sxa5!
    • 1.Qg1?
      • threat
        • 2.Qh2#
        • 2.Qg3#
        • 2.Qg6#
      • 1...Sxa5
        • 2.Qxc5#
        • 2.Qg6#
      • 1...Sxd8
        • 2.Qxc5#
      • 1...dxc4
        • 2.Qd1#
      • 1...d4!
    • 1.Qh1?
      • threat
        • 2.Qh2#
        • 2.Qh6#
      • 1...Sxa5
        • 2.Qh6#
      • 1...dxc4
        • 2.Sxb7#
        • 2.Qd1#
      • 1...d4
        • 2.Sxb7#
      • 1...Sxd8!
    • 1.Qb2?
      • threat
        • 2.Qe5#
        • 2.Qf6#
        • 2.Qh2#
      • 1...Sxa5
        • 2.Qf6#
      • 1...Sxd8
        • 2.Qe5#
      • 1...dxc4
        • 2.Qe5#
        • 2.Qd2#
      • 1...d4!
  • Keys
    • 1.Qb4!
      • 1...Sxa5
        • 2.Qxc5#
      • 1...Sxd8
        • 2.Qxc5#
      • 1...bxc4
        • 2.Qb6#
      • 1...cxb4
        • 2.Sxb7#
      • 1...dxc4
        • 2.Qd2#
      • 1...d4
        • 2.Rxd4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATE,XR(B)::QAR2(A)
    • P(c);OGATEB,XR(B)::QAR(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(e);XS(C)::QAR2(A)
        • S(e);XB(E)::QAB1(A)
      • Refutation
        • P(c);
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • S(e);XB(E)::QAB1(A)
        • P(c);::QAB1(A)
      • Refutation
        • S(e);XS(C)
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • S(e);N_GUARD,XB(E)::QAB1(A),XP(b)
        • P(c);OGATEB,XR(B)::QAR(A)
      • Refutation
        • P(c);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(e);XS(C)::QAR(A)
        • P(c);::S(C),XS(e)
      • Refutation
        • S(e);XB(E)
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • S(e);XS(C)::QAR2(A)
        • S(e);XB(E)::QAB1(A)
      • Refutation
        • P(c);
  • Actual
    • Q(A);P_PINP(b)
    • Vars
      • S(e);N_GUARD,XS(C)::QAB1(A),XP(b)
      • S(e);N_GUARD,XB(E)::QAB1(A),XP(b)
      • P(a);OGATE,XR(B)::QAR2(A)
      • P(b);N_SPINP(b),XQ(A)::S(C),XS(e)
      • P(c);OGATEB,XR(B)::QAR(A)
      • P(c);OGATEB::R(B),XP(c)
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).