MESON Chess Problem Database

Problem Display
PID: 16506 (3nQ3/8/3p4/2pkPK2/3p4/2RpR2p/8/5B2 w - - 0 1)

Downer, GR

Chess, 1941

3nQ3/8/3p4/2pkPK2/3p4/2RpR2p/8/5B2

#2

6 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Sc6
      • 2.Qf7#
      • 2.Qe6#
      • 2.Qg8#
    • 1...Se6
      • 2.Qa8#
    • 1...Sf7
      • 2.Qa8#
    • 1...d2
      • 2.Bc4#
    • 1...h2
      • 2.Bg2#
    • 1...c4
      • 2.Qb5#
    • 1...dxe5
      • 2.Qd7#
  • Tries
    • 1.Rexd3?
      • 1...dxe5
        • 2.Qd7#
      • 1...c4
        • 2.Qb5#
      • 1...Sc6
        • 2.Qf7#
        • 2.Qe6#
        • 2.Qg8#
      • 1...Se6
        • 2.Qa8#
      • 1...Sf7
        • 2.Qa8#
      • 1...h2
        • 2.Bg2#
      • 1...Sb7!
    • 1.Rxh3?
      • threat
        • 2.Bg2#
      • 1...dxe5
        • 2.Qd7#
      • 1...c4
        • 2.Qb5#
      • 1...dxc3!
    • 1.Qa4?
      • 1...dxc3
        • 2.Rxd3#
        • 2.Qe4#
      • 1...dxe3
        • 2.Rxd3#
        • 2.Qe4#
      • 1...dxe5
        • 2.Qd7#
      • 1...c4
        • 2.Qb5#
        • 2.Qxc4#
      • 1...Sc6
        • 2.Qc4#
      • 1...Se6
        • 2.Qa8#
      • 1...Sf7
        • 2.Qa8#
      • 1...d2
        • 2.Bc4#
      • 1...h2
        • 2.Bg2#
      • 1...Sb7!
    • 1.Qd7?
      • threat
        • 2.Qxd6#
      • 1...Sb7
        • 2.Qxb7#
      • 1...Sf7
        • 2.Qb7#
      • 1...dxc3!
    • 1.Qg8+?
      • 1...Se6
        • 2.Qa8#
      • 1...Sf7
        • 2.Qa8#
      • 1...Kc6!
  • Keys
    • 1.Qb5!
      • 1...dxc3
        • 2.Rxd3#
      • 1...dxe3
        • 2.Rxd3#
      • 1...dxe5
        • 2.Qd7#
        • 2.Qxc5#
      • 1...Sb7
        • 2.Qxb7#
      • 1...Sc6
        • 2.Qc4#
      • 1...Se6
        • 2.Qb7#
      • 1...Sf7
        • 2.Qb7#
      • 1...d2
        • 2.Bc4#
      • 1...h2
        • 2.Bg2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • S(g);OGATE::QAB(F)
    • P(a);OGATE::B(A)
    • P(b);N_GUARD::B(A)
    • P(d);OGATEB::QAR2(F)
    • P(f);OGATEB,XP(D)::QAR2(F)
  • Tries
    • Try
      • R(C);P_PINP(c),XP(a)
      • Vars
        • P(f);OGATEB,XP(D)::QAR2(F)
        • P(d);OGATEB::QAR2(F)
        • S(g);OGATE::QAB(F)
        • P(b);N_GUARD::B(A)
      • Refutation
        • S(g);
    • Try
      • R(C);XP(b)
      • Threat
        • B(A)
      • Vars
        • P(f);OGATEB,XP(D)::QAR2(F)
        • P(d);OGATEB::QAR2(F)
      • Refutation
        • P(c);XR(B)
    • Try
      • Q(F);
      • Vars
        • P(f);OGATEB,XP(D)::QAR2(F)
        • S(g);SBLOCK::QAB1(F)
        • S(g);N_GUARD::QAB(F)
        • P(a);OGATE::B(A)
        • P(b);N_GUARD::B(A)
      • Refutation
        • S(g);
    • Try
      • Q(F);P_PINP(f)
      • Threat
        • QAR1(F),XP(f)
      • Vars
        • S(g);N_GUARD::QAB(F),XS(g)
        • S(g);N_GUARD::QAB(F)
      • Refutation
        • P(c);XR(B)
    • Try
      • Q(F);CHECK
      • Vars
        • S(g);OGATE,P_SPINS(g)::QAB(F)
      • Refutation
        • K(e);P_SPINP(d),S_FLIGHT
  • Actual
    • Q(F);P_PINP(d)
    • Vars
      • P(c);OGATEB,XR(B)::R(C),XP(a)
      • P(c);OGATEB,XR(C)::R(B),XP(a)
      • S(g);N_GUARD::QAB(F),XS(g)
      • S(g);SBLOCK::QAB1(F)
      • S(g);N_GUARD::QAB(F)
      • P(a);OGATE::B(A)
      • P(b);N_GUARD::B(A)
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).