MESON Chess Problem Database

Problem Display
PID: 139479 (N7/pN2pp2/2p1rr2/pkq1Q2R/1PR5/1P6/2KP4/5B2 w - - 0 1)

Ellerman, Arnoldo

L'Echiquier, 1926

N7/pN2pp2/2p1rr2/pkq1Q2R/1PR5/1P6/2KP4/5B2

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5
      • 2.Rf4#
    • 1...Qxe5
      • 2.Rf4#
    • 1...axb4
      • 2.Rxc5#
    • 1...a6
      • 2.Qxc5#
  • Tries
    • 1.Rc3+?
      • 1...Kxb4
        • 2.Qxc5#
      • 1...Rxf1!
    • 1.Qa1?
      • threat
        • 2.Qxa5#
      • 1...Qf5+
        • 2.Re4#
      • 1...axb4
        • 2.Rcxc5#
        • 2.Rhxc5#
        • 2.Qa4#
        • 2.Qa5#
      • 1...a4
        • 2.Qxa4#
      • 1...Ka6!
    • 1.Qc7?
      • threat
        • 2.Qxa5#
      • 1...Qf5+
        • 2.Re4#
      • 1...axb4
        • 2.Rcxc5#
        • 2.Qa5#
      • 1...a4
        • 2.Qa5#
      • 1...Ka6!
    • 1.bxc5?
      • threat
        • 2.Sc7#
        • 2.Rf4#
      • 1...Rxe5
        • 2.Sc7#
      • 1...Rxf1
        • 2.Sc7#
      • 1...Rd6
        • 2.Sc7#
      • 1...Rf2
        • 2.Sc7#
      • 1...Rf3
        • 2.Sc7#
      • 1...Rf4
        • 2.Sc7#
        • 2.Rxf4#
      • 1...Ka6!
  • Keys
    • 1.Qb8!
      • threat
        • 2.Sxc5#
      • 1...Qf5+
        • 2.Re4#
      • 1...Ka6
        • 2.Sxc5#
      • 1...Qxh5
        • 2.Sc5#
      • 1...axb4
        • 2.Rcxc5#
      • 1...Qd5
        • 2.Sc5#
      • 1...Qe5
        • 2.Rf4#
      • 1...Qg5
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(c);N_PINR(F)::B(A)+R(F)
    • Q(c);N_PINR(F),XQ(G)::B(A)+R(F)
    • P(a);SBLOCK,XP(E)::B(A)+R(F),DCHECK,XQ(c)
    • P(g);SBLOCK::QAR1(G),XQ(c)
  • Tries
    • Try
      • R(F);CHECK
      • Vars
        • K(b);N_SPINQ(c),P-FLIGHT,XP(E)::QAB1(G),XQ(c)
      • Refutation
        • R(f);XB(A)
    • Try
      • Q(G);
      • Threat
        • QAR1(G),XP(a)
      • Vars
        • Q(c);CHECK,N_PINR(F)::B(A)+R(F)
        • P(a);::QAB1(G),XP(a)
      • Refutation
        • K(b);N_SPINQ(c),P_SPINP(a),S_FLIGHT
    • Try
      • Q(G);
      • Threat
        • QAR1(G),XP(a)
      • Vars
        • Q(c);CHECK,N_PINR(F)::B(A)+R(F)
        • P(a);::QAR1(G)
      • Refutation
        • K(b);N_SPINQ(c),S_FLIGHT
    • Try
      • P(E);N_SPINR(F),XQ(c)
      • Threat
        • DUALS(2)
      • Vars
        • R(e);XQ(G)::S(J)
        • R(f);XB(A)::S(J)
        • R(e);::S(J)
        • R(f);P_PINP(C)::S(J)
        • R(f);::S(J)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(G);
    • Threat
      • QAR(G)+S(I),XQ(c)
    • Vars
      • Q(c);CHECK,N_PINR(F)::B(A)+R(F)
      • K(b);N_SPINQ(c),S_FLIGHT::S(I),XQ(c)
      • Q(c);N_PINR(F),N_SPINQ(c),XR(H)::QAR(G)+S(I)
      • P(a);SBLOCK,XP(E)::B(A)+R(F),DCHECK,XQ(c)
      • Q(c);N_PINR(F)::QAR(G)+S(I)
      • Q(c);N_PINR(F)::B(A)+R(F)
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).