MESON Chess Problem Database

Problem Display
PID: 176211 (8/3R4/6P1/2r1kBRN/2p3p1/p7/K1P1N3/1n2B2n w - - 0 1)

Paalanen, Erkki

Schach-Echo, 1972

8/3R4/6P1/2r1kBRN/2p3p1/p7/K1P1N3/1n2B2n

#2

9 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sc3+
      • 2.Bxc3#
    • 1...Sg3
      • 2.Bxg3#
  • Tries
    • 1.Seg3?
      • threat
        • 2.Bxg4#
      • 1...Sc3+
        • 2.Bxc3#
      • 1...Sxg3
        • 2.Bxg3#
      • 1...Rd5!
    • 1.Sd4?
      • threat
        • 2.Bd3#
      • 1...Rd5
        • 2.Sc6#
      • 1...Sg3
        • 2.Bxg3#
      • 1...Sc3+!
    • 1.Sef4?
      • threat
        • 2.Bd3#
      • 1...Sc3+
        • 2.Bxc3#
      • 1...Rd5
        • 2.Rxd5#
      • 1...Sg3!
    • 1.Bd2?
      • threat
        • 2.Bf4#
      • 1...Sc3+
        • 2.Bxc3#
      • 1...Sxd2!
  • Keys
    • 1.Sc3!
      • threat
        • 2.Bxg4#
      • 1...Sxc3+
        • 2.Bxc3#
      • 1...Rd5
        • 2.Rxd5#
      • 1...Sg3
        • 2.Bxg3#
      • 1...g3
        • 2.Bh3#
        • 2.Bg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(a);CHECK,N_GUARD::B(A),XS(a)
    • S(b);N_GUARD::B(A),XS(b)
  • Tries
    • Try
      • S(D);
      • Threat
        • R(F)+B(E),XP(e)
      • Vars
        • S(a);CHECK,N_GUARD::B(A),XS(a)
        • S(b);OGATE,XS(D)::B(A),XS(b)
      • Refutation
        • R(f);
    • Try
      • S(D);
      • Threat
        • R(F)+B(E)
      • Vars
        • R(f);N_GUARD::S(D)
        • S(b);N_GUARD::B(A),XS(b)
      • Refutation
        • S(a);CHECK
    • Try
      • S(D);
      • Threat
        • R(F)+B(E)
      • Vars
        • S(a);CHECK,N_GUARD::B(A),XS(a)
        • R(f);N_GUARD::R1(I),XR(f)
      • Refutation
        • S(b);
    • Try
      • B(A);
      • Threat
        • B(A)
      • Vars
        • S(a);CHECK,N_GUARD::B(A),XS(a)
      • Refutation
        • S(a);XB(A)
  • Actual
    • S(D);
    • Threat
      • R(F)+B(E),XP(e)
    • Vars
      • S(a);CHECK,OGATE,XS(D)::B(A),XS(a)
      • R(f);N_GUARD::R1(I),XR(f)
      • S(b);N_GUARD::B(A),XS(b)
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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).