MESON Chess Problem Database

Problem Display
PID: 276635 (8/8/2rr1p2/Q5NK/R1Pk1Bp1/8/5N2/b7 w - - 0 1)

Valve, Leo Erland

Stella Polaris, 1970

8/8/2rr1p2/Q5NK/R1Pk1Bp1/8/5N2/b7

#2

7 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Rc5
      • 2.Qd2#
    • 1...Rd5
      • 2.c5#
    • 1...g3
      • 2.Sf3#
    • 1...fxg5
      • 2.Qe5#
    • 1...f5
      • 2.Qe5#
  • Tries
    • 1.Kxg4?
      • threat
        • 2.Sf3#
      • 1...fxg5
        • 2.Qe5#
      • 1...f5+!
    • 1.Sfe4?
      • threat
        • 2.Qd2#
      • 1...Kd3
        • 2.Qd2#
      • 1...Bc3
        • 2.Qxc3#
      • 1...fxg5!
    • 1.Be5+?
      • 1...Ke3
        • 2.Qe1#
      • 1...fxe5!
  • Keys
    • 1.Sge4!
      • threat
        • 2.Qd2#
      • 1...Rc5+
        • 2.Qxc5#
      • 1...Rd5+
        • 2.Qxd5#
      • 1...Bc3
        • 2.Qxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • R(d);P_PINS(F),SBLOCK::QAR2(E)
    • R(e);P_PINS(F),SBLOCK::R(B)+P(C)
    • P(c);N_GUARD::S(F)
    • P(f);N_GUARD,XS(F)::QAB1(E)
    • P(f);N_GUARD::QAB1(E)
  • Tries
    • Try
      • K(G);S_FLIGHT,XP(c)
      • Threat
        • S(F)
      • Vars
        • P(f);N_GUARD,XS(F)::QAB1(E)
      • Refutation
        • P(f);CHECK
    • Try
      • S(A);
      • Threat
        • QAR2(E)
      • Vars
        • K(b);P-FLIGHT::QAR1(E)
        • B(a);N_GUARD::QAB1(E),XB(a)
      • Refutation
        • P(f);XS(F)
    • Try
      • B(D);CHECK
      • Vars
        • K(b);N_GUARD,S_CUTP(f),S_FLIGHT::QAR2(E)
      • Refutation
        • P(f);XB(D)
  • Actual
    • S(F);
    • Threat
      • QAR2(E)
    • Vars
      • R(d);CHECK,N_GUARD::QAB1(E),XR(d)
      • R(e);CHECK,N_GUARD::QAR1(E),XR(e)
      • B(a);N_GUARD::QAB1(E),XB(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).