MESON Chess Problem Database

Problem Display
PID: 231865 (2q1r3/5Q2/1Bp3N1/8/p2pk2N/2p2R2/B3n3/K5n1 w - - 0 1)

Wielgos, Oskar

Deutsche Schachzeitung, 1980

2q1r3/5Q2/1Bp3N1/8/p2pk2N/2p2R2/B3n3/K5n1

#2

7 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qf5
      • 2.Qxf5#
    • 1...Qa6
      • 2.Qxe8#
      • 2.Qf5#
    • 1...Qb7
      • 2.Qf5#
    • 1...Qc7
      • 2.Qf5#
    • 1...Qa8
      • 2.Qf5#
    • 1...Qb8
      • 2.Qf5#
    • 1...Qd8
      • 2.Qf5#
    • 1...Re6
      • 2.Qf5#
    • 1...Sxf3
      • 2.Qxf3#
    • 1...Sc1
      • 2.Qf4#
    • 1...Sg3
      • 2.Qf4#
    • 1...Sf4
      • 2.Qxf4#
    • 1...d3
      • 2.Re3#
    • 1...c5
      • 2.Bd5#
      • 2.Qd5#
  • Tries
    • 1.Bb1+?
      • 1...d3
        • 2.Bxd3#
        • 2.Re3#
      • 1...c2!
    • 1.Bc4?
      • threat
        • 2.Bd3#
      • 1...Sxf3
        • 2.Qxf3#
      • 1...Qa6
        • 2.Qxe8#
        • 2.Qf5#
      • 1...Re6
        • 2.Qf5#
      • 1...Sc1
        • 2.Qf4#
      • 1...Sf4
        • 2.Qxf4#
      • 1...d3
        • 2.Bxd3#
        • 2.Re3#
      • 1...Qe6!
    • 1.Qxe8+?
      • 1...Qe6
        • 2.Qxe6#
      • 1...Qxe8!
  • Keys
    • 1.Qc4!
      • threat
        • 2.Qd3#
      • 1...Sxf3
        • 2.Qxe2#
      • 1...Qa6
        • 2.Qxc6#
      • 1...Sc1
        • 2.Qxd4#
      • 1...Sf4
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 9
  • Sets
    • Q(h);N_GUARD::QAB1(G),XQ(h)
    • Q(h);N_GUARD::QAB1(G)
    • R(i);S_CUTQ(h)::QAB1(G)
    • S(a);OGATE,XR(C)::QAB1(G),XS(a)
    • S(b);N_GUARD::QAR1(G)
    • S(b);N_GUARD::QAR1(G),XS(b)
    • P(e);N_GUARD::R1(C)
  • Tries
    • Try
      • B(B);CHECK
      • Refutation
        • P(c);P_SPINP(c)
    • Try
      • B(B);
      • Threat
        • B(B)
      • Vars
        • S(a);OGATE,XR(C)::QAB1(G),XS(a)
        • R(i);S_CUTQ(h)::QAB1(G)
        • S(b);N_GUARD::QAR1(G)
        • S(b);N_GUARD::QAR1(G),XS(b)
      • Refutation
        • Q(h);
    • Try
      • Q(G);CHECK,XR(i)
      • Vars
        • Q(h);N_GUARD,P_SPINQ(h)::QAR2(G),XQ(h)
      • Refutation
        • Q(h);XQ(G)
  • Actual
    • Q(G);P_PINP(e)
    • Threat
      • QAB1(G)
    • Vars
      • S(a);N_GUARD,XR(C)::QAR2(G),XS(b)
      • Q(h);N_GUARD::QAB(G),XP(g)
      • S(b);N_GUARD::QAR1(G),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).