MESON Chess Problem Database

Problem Display
PID: 202414 (1K6/ppQ5/4p3/4Nn2/2pk1b2/1bn3p1/1B2RNBp/2r5 w - - 0 1)

Wahlmark, Carl Primus

3rd Prize, Good Companions, 1923

1K6/ppQ5/4p3/4Nn2/2pk1b2/1bn3p1/1B2RNBp/2r5

#2

7 + 12

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bd1
      • 2.Qxc4#
    • 1...Bc2
      • 2.Qxc4#
    • 1...Ba4
      • 2.Qxc4#
    • 1...Bxe5
      • 2.Qxe5#
    • 1...Se3
      • 2.Rd2#
    • 1...Sh4
      • 2.Qd6#
    • 1...Sd6
      • 2.Qxd6#
    • 1...Sh6
      • 2.Qd6#
    • 1...Sg7
      • 2.Qd6#
    • 1...a5
      • 2.Qb6#
    • 1...a6
      • 2.Qb6#
    • 1...b5
      • 2.Qxa7#
  • Tries
    • 1.Qd8+?
      • 1...Sd6
        • 2.Qxd6#
      • 1...Kc5!
    • 1.Qd7+?
      • 1...Sd6
        • 2.Qxd6#
      • 1...Kc5!
  • Keys
    • 1.Qa5!
      • threat
        • 2.Re4#
      • 1...Bxe5+
        • 2.Qxe5#
      • 1...b5
        • 2.Qxa7#
      • 1...Re1
        • 2.Bxc3#
      • 1...Bc2
        • 2.Bxc3#
      • 1...Be3
        • 2.Sf3#
      • 1...Se3
        • 2.Rd2#
      • 1...Sd6
        • 2.Sf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 7
  • Sets
    • B(c);N_GUARD::QAR1(F),XP(f)
    • B(h);OGATE,P_PINQ(F),XS(E)::QAB1(F),XB(h)
    • S(i);SBLOCK,S_CUTB(h)::R(B)
    • S(i);N_GUARD::QAR2(F)
    • S(i);N_GUARD::QAR2(F),XS(i)
    • P(k);N_GUARD::QAB(F)
    • P(l);OGATE::QAB(F),XP(k)
  • Tries
    • Try
      • Q(F);CHECK,P_SPINS(E)
      • Vars
        • S(i);N_GUARD,N_PINS(E)::QAR2(F),XS(i)
      • Refutation
        • K(g);N_SPINS(d),S_FLIGHT
    • Try
      • Q(F);CHECK,P_SPINS(E)
      • Vars
        • S(i);N_GUARD,N_PINS(E)::QAR2(F),XS(i)
      • Refutation
        • K(g);N_SPINS(d),S_FLIGHT
  • Actual
    • Q(F);P_SPINS(E)
    • Threat
      • R1(B)
    • Vars
      • B(h);CHECK,OGATE,XS(E)::QAB1(F),XB(h)
      • P(l);N_GUARD::QAB(F),XP(k)
      • R(a);N_GUARD::B(A),XS(d)
      • B(c);S_CUTR(a)::B(A),XS(d)
      • B(h);N_PINS(E)::S(E)
      • S(i);SBLOCK,S_CUTB(h)::R(B)
      • S(i);N_PINS(E)::S(E)
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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).