MESON Chess Problem Database

Problem Display
PID: 249774 (K7/1pbQpRB1/p3P3/1n1N4/2Ppk3/r7/3PP1p1/6qN w - - 0 1)

Wirtanen, Erkki Aukusti

Stella Polaris, 1969

K7/1pbQpRB1/p3P3/1n1N4/2Ppk3/r7/3PP1p1/6qN

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qf2
      • 2.Sxf2#
    • 1...Qh2
      • 2.Sf2#
    • 1...Qa1
      • 2.Sf2#
    • 1...Qb1
      • 2.Sf2#
    • 1...Qc1
      • 2.Sf2#
    • 1...Qd1
      • 2.Sf2#
    • 1...Ra1
      • 2.d3#
    • 1...Ra2
      • 2.d3#
    • 1...Ra4
      • 2.d3#
    • 1...Ra5
      • 2.d3#
    • 1...Bf4
      • 2.Rxf4#
    • 1...Ba5
      • 2.Rf4#
    • 1...Bb6
      • 2.Rf4#
    • 1...Bd8
      • 2.Rf4#
    • 1...Sc3
      • 2.d3#
    • 1...Sd6
      • 2.Rf4#
  • Tries
    • 1.Sc3+?
      • 1...Rxc3
        • 2.Qd5#
      • 1...dxc3
        • 2.Qd3#
        • 2.Qd5#
      • 1...Sxc3!
    • 1.Sf4?
      • threat
        • 2.Qd5#
      • 1...Bd6
        • 2.Qxb7#
      • 1...Sc3
        • 2.Sg3#
      • 1...Sd6!
    • 1.Qc6?
      • threat
        • 2.Sc3#
      • 1...Rc3
        • 2.Sxc3#
      • 1...Sc3
        • 2.Sxc3#
        • 2.d3#
      • 1...bxc6!
    • 1.Qxc7?
      • threat
        • 2.Rf4#
        • 2.Qf4#
        • 2.Qe5#
      • 1...Sd6
        • 2.Rf4#
      • 1...Qf2
        • 2.Sxf2#
        • 2.Qe5#
      • 1...Qh2
        • 2.Sf2#
      • 1...Qe3
        • 2.Qe5#
      • 1...Qf1
        • 2.Qe5#
      • 1...Rf3
        • 2.Qe5#
      • 1...Sxc7+!
  • Keys
    • 1.Se3!
      • threat
        • 2.Qd5#
      • 1...Bd6
        • 2.Qxb7#
      • 1...Sc3
        • 2.Qxd4#
      • 1...Sd6
        • 2.Sg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 14
  • Sets
    • Q(a);N_GUARD::S(A),XQ(a)
    • Q(a);N_GUARD::S(A)
    • R(c);N_GUARD::P(B)
    • B(i);N_GUARD::R1(H),XB(i)
    • B(i);N_GUARD::R1(H)
    • S(f);S_CUTR(c)::P(B)
    • S(f);S_CUTB(i)::R1(H)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • R(c);XS(E)::QAB1(G)
      • Refutation
        • S(f);XS(E)
    • Try
      • S(E);
      • Threat
        • QAB1(G)
      • Vars
        • B(i);OGATE::QAB(G),XP(h)
        • S(f);S_CUTR(c)::S(A)
      • Refutation
        • S(f);
    • Try
      • Q(G);
      • Threat
        • QAB(G)+S(E),DCHECK
      • Vars
        • R(c);::QAB(G)+S(E),DCHECK,XR(c)
      • Refutation
        • P(h);XQ(G)
    • Try
      • Q(G);XB(i)
      • Threat
        • DUALS(3)
      • Vars
        • S(f);::R1(H)
        • Q(a);N_GUARD::S(A)
        • Q(a);::QAR1(G)
        • R(c);::QAR1(G)
      • Refutation
        • S(f);CHECK,XQ(G)
  • Actual
    • S(E);
    • Threat
      • QAB1(G)
    • Vars
      • B(i);OGATE::QAB(G),XP(h)
      • S(f);N_GUARD::QAR1(G),XP(d)
      • S(f);S_CUTB(i)::S(A)
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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).