MESON Chess Problem Database

Problem Display
PID: 204461 (8/1p6/1K1N1R2/1QNkp3/3b1p2/B7/b1qR4/8 w - - 0 1)

Ellerman, Arnoldo

L'Echiquier, 1925

8/1p6/1K1N1R2/1QNkp3/3b1p2/B7/b1qR4/8

#2

7 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc5+
      • 2.Qxc5#
  • Tries
    • 1.Kxb7?
      • threat
        • 2.Qc6#
      • 1...Qh7+
        • 2.Sd7#
      • 1...Qxc5
        • 2.Qxc5#
      • 1...Qb1
        • 2.Sb3#
      • 1...Qb3
        • 2.Sxb3#
      • 1...Qa4
        • 2.Sxa4#
      • 1...Qb2
        • 2.Sb3#
      • 1...e4!
    • 1.Sc4?
      • threat
        • 2.Rd6#
      • 1...Qxc4
        • 2.Qd7#
      • 1...Bxc4
        • 2.Qd7#
      • 1...Qg6!
    • 1.Sc8?
      • threat
        • 2.Se7#
        • 2.Rd6#
      • 1...e4
        • 2.Rf5#
      • 1...Qg6
        • 2.Se7#
      • 1...Qh7
        • 2.Rd6#
      • 1...Qxc5+!
    • 1.Se8?
      • threat
        • 2.Sc7#
        • 2.Rd6#
      • 1...e4
        • 2.Rf5#
      • 1...Qg6
        • 2.Sc7#
      • 1...Qh7
        • 2.Rd6#
      • 1...Qxc5+!
  • Keys
    • 1.Kc7!
      • threat
        • 2.Qxb7#
      • 1...Qh7+
        • 2.Sd7#
      • 1...Qxc5+
        • 2.Qxc5#
      • 1...e4
        • 2.Rf5#
      • 1...Qb1
        • 2.Sb3#
      • 1...Qb3
        • 2.Sxb3#
      • 1...Qa4
        • 2.Sxa4#
      • 1...Qb2
        • 2.Sb3#
      • 1...b6
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • Q(b);CHECK,OGATE,P_SPINQ(b),XS(D)::QAR1(C),XQ(b)
  • Tries
    • Try
      • K(E);N_SPINS(D),P-FLIGHT,XP(g)
      • Threat
        • QAB1(C)
      • Vars
        • Q(b);CHECK,N_GUARD::QAR(C)+S(D)
        • Q(b);OGATE,P_SPINQ(b),XS(D)::QAR1(C),XQ(b)
        • Q(b);N_GUARD,P_PINQ(C)::QAR(C)+S(D)
        • Q(b);N_GUARD,P_PINQ(C)::QAR(C)+S(D),XQ(b)
        • Q(b);N_GUARD::QAR(C)+S(D),XQ(b)
      • Refutation
        • P(f);
    • Try
      • S(F);
      • Threat
        • R1(G)
      • Vars
        • Q(b);SBLOCK,XS(F)::QAR2(C)
        • B(a);SBLOCK,XS(F)::QAR2(C)
      • Refutation
        • Q(b);P_PINR(G)
    • Try
      • S(F);
      • Threat
        • DUALS(2)
      • Vars
        • P(f);OGATEB::R(G)
        • Q(b);P_PINR(G)::S(F)
        • Q(b);::R1(G)
      • Refutation
        • Q(b);CHECK,P_SPINQ(b),XS(D)
    • Try
      • S(F);
      • Threat
        • DUALS(2)
      • Vars
        • P(f);OGATEB::R(G)
        • Q(b);P_PINR(G)::S(F)
        • Q(b);::R1(G)
      • Refutation
        • Q(b);CHECK,P_SPINQ(b),XS(D)
  • Actual
    • K(E);S_FLIGHT
    • Threat
      • QAB(C),XP(g)
    • Vars
      • Q(b);CHECK,N_PINS(D)::QAR(C)+S(D)
      • Q(b);CHECK,OGATE,P_SPINQ(b),XS(D)::QAR1(C),XQ(b)
      • P(f);OGATEB::R(G)
      • Q(b);N_PINS(D)::QAR(C)+S(D)
      • Q(b);N_PINS(D)::QAR(C)+S(D),XQ(b)
      • P(g);N_GUARD::QAB1(C)
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).