MESON Chess Problem Database

Problem Display
PID: 203534 (8/pQ6/1b5n/3K1p2/p7/Pk1N1R2/pPpq4/2B2B2 w - - 0 1)

Usath, Walter

4th HM., Essener Arbeiter Schachzeitung, 1924

8/pQ6/1b5n/3K1p2/p7/Pk1N1R2/pPpq4/2B2B2

#2

8 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qe1
      • 2.Sxe1#
      • 2.Sc5#
    • 1...Qc3
      • 2.Sc5#
    • 1...Qe3
      • 2.Sc5#
    • 1...Qb4
      • 2.Sc5#
    • 1...Qf4
      • 2.Sxf4#
      • 2.Sc5#
    • 1...Qa5+
      • 2.Sc5#
    • 1...Qg5
      • 2.Sf4#
      • 2.Sc5#
    • 1...Qe2
      • 2.Sc5#
    • 1...Qf2
      • 2.Sxf2#
      • 2.Sc5#
    • 1...Qg2
      • 2.Sc5#
    • 1...Qh2
      • 2.Se1#
      • 2.Sf2#
      • 2.Sf4#
      • 2.Sc5#
      • 2.Se5#
    • 1...Qxd3+
      • 2.Rxd3#
  • Tries
    • 1.Qa6?
      • threat
        • 2.Qc4#
      • 1...Qa5+
        • 2.Sc5#
      • 1...Qxd3+
        • 2.Rxd3#
        • 2.Qxd3#
      • 1...Qb4
        • 2.Sc5#
      • 1...Qf4
        • 2.Sc5#
      • 1...Qc3!
    • 1.Qc6?
      • threat
        • 2.Qc4#
      • 1...Qa5+
        • 2.Sc5#
      • 1...Qxd3+
        • 2.Rxd3#
      • 1...Qc3
        • 2.Qxc3#
      • 1...Qb4
        • 2.Sc5#
      • 1...Qf4
        • 2.Sc5#
        • 2.Qc3#
      • 1...Bc5!
    • 1.Qxb6+?
      • 1...Qb4
        • 2.Se1#
        • 2.Sf2#
        • 2.Sxb4#
        • 2.Sf4#
        • 2.Sc5#
        • 2.Se5#
        • 2.Qxb4#
      • 1...axb6!
  • Keys
    • 1.Kd6!
      • threat
        • 2.Qd5#
      • 1...Qb4+
        • 2.Sc5#
      • 1...Qf4+
        • 2.Sxf4#
      • 1...Qh2+
        • 2.Sf4#
        • 2.Se5#
      • 1...Sf7+
        • 2.Qxf7#
      • 1...Kc4
        • 2.Qd5#
      • 1...Qc3
        • 2.Sc5#
      • 1...Qa5
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(c);N_PINS(E)::S(E)
    • Q(c);N_PINS(E),N_SPINB(g)::R(F)+S(E),DCHECK
    • Q(c);CHECK,N_PINS(E)::R(F)+S(E),DCHECK
    • Q(c);N_PINS(E)::R(F)+S(E),DCHECK
    • Q(c);N_PINS(E),P_PINR(F)::R(F)+S(E),DCHECK
    • Q(c);CHECK,OGATE,P_SPINQ(c),XS(E)::R(F),XQ(c)
  • Tries
    • Try
      • Q(H);N_PINB(g)
      • Threat
        • QAB1(H)
      • Vars
        • Q(c);CHECK,N_PINS(E)::R(F)+S(E),DCHECK
        • Q(c);N_PINS(E)::R(F)+S(E),DCHECK
      • Refutation
        • Q(c);N_PINS(E)
    • Try
      • Q(H);N_PINB(g)
      • Threat
        • QAB1(H)
      • Vars
        • Q(c);CHECK,N_PINS(E)::R(F)+S(E),DCHECK
        • Q(c);CHECK,OGATE,P_SPINQ(c),XS(E)::R(F),XQ(c)
        • Q(c);N_GUARD,N_PINS(E)::QAR1(H),XQ(c)
        • Q(c);N_PINS(E)::R(F)+S(E),DCHECK
      • Refutation
        • B(g);
    • Try
      • Q(H);CHECK,XB(g)
      • Refutation
        • P(i);XQ(H)
  • Actual
    • K(G);P-FLIGHT
    • Threat
      • QAB(H)
    • Vars
      • Q(c);CHECK,N_PINS(E),N_SPINB(g)::R(F)+S(E),DCHECK
      • Q(c);CHECK,N_PINS(E)::R(F)+S(E),XQ(c)
      • S(h);CHECK,N_GUARD::QAB(H),XS(h)
      • K(d);N_SPINB(g),S_FLIGHT::QAB1(H)
      • Q(c);N_PINS(E)::S(E)
      • Q(c);N_PINS(E)::R(F)+S(E),DCHECK
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).