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Problem Display

PID: 45648 (3N1r2/4n2r/R6p/1K2Pkp1/4N3/1pQn1P2/4p2B/1B1q4 w - - 0 1)

Strerath, Otto

6th Comm., BCF 057. Ty., 1947-1948

3N1r2/4n2r/R6p/1K2Pkp1/4N3/1pQn1P2/4p2B/1B1q4

#2

9 + 10

461	Schach-Express	1949

SOLUTION

SOUND
Sets
- 1...Rf6
  - 2.Rxf6#
- 1...Rxd8
  - 2.Rf6#
- 1...Re8
  - 2.Rf6#
- 1...Rg8
  - 2.Rf6#
- 1...Rh8
  - 2.Rf6#
- 1...Sc1
  - 2.Sd6#
- 1...Se1
  - 2.Sd6#
- 1...Sb2
  - 2.Sd6#
- 1...Sf2
  - 2.Sd6#
- 1...Sb4
  - 2.Sd6#
- 1...Sf4
  - 2.Sg3#
  - 2.Sd6#
- 1...Sc5
  - 2.Sd6#
- 1...Sxe5
  - 2.Qxe5#
- 1...Sg6
  - 2.Sd6#
Tries
- 1.Qd4?
  - threat
    - 2.Sg3#
    - 2.Qd7#
  - 1...Rxd8
    - 2.Sg3#
    - 2.Rf6#
  - 1...Sxe5
    - 2.Sg3#
    - 2.Qxe5#
  - 1...Rf6
    - 2.Rxf6#
  - 1...e1Q
    - 2.Qd7#
  - 1...e1B
    - 2.Qd7#
  - 1...g4
    - 2.Qd7#
  - 1...Qe1
    - 2.Qd7#
  - 1...Qg1
    - 2.Qd7#
  - 1...Sc1
    - 2.Sg3#
    - 2.Sd6#
  - 1...Se1
    - 2.Sg3#
    - 2.Sd6#
  - 1...Sb2
    - 2.Sg3#
    - 2.Sd6#
  - 1...Sf2
    - 2.Sg3#
    - 2.Sd6#
  - 1...Sb4
    - 2.Sg3#
    - 2.Sd6#
  - 1...Sf4
    - 2.Sg3#
    - 2.Sd6#
  - 1...Sc5
    - 2.Sg3#
    - 2.Sd6#
  - 1...Sd5
    - 2.Sg3#
  - 1...Sg6
    - 2.Sg3#
    - 2.Sd6#
  - 1...Sc8
    - 2.Sg3#
  - 1...Sg8
    - 2.Sg3#
  - 1...Sc6!
Keys
- 1.Qc7!
  - threat
    - 2.Qd7#
  - 1...Rxd8
    - 2.Rf6#
  - 1...Sxe5
    - 2.Qxe5#
  - 1...Rf6
    - 2.Rxf6#
  - 1...Sc6
    - 2.Qxh7#
  - 1...Sc1
    - 2.Sd6#
  - 1...Se1
    - 2.Sd6#
  - 1...Sb2
    - 2.Sd6#
  - 1...Sf2
    - 2.Sd6#
  - 1...Sb4
    - 2.Sd6#
  - 1...Sf4
    - 2.Sg3#
  - 1...Sc5
    - 2.Sd6#
  - 1...Sd5
    - 2.Qxh7#
  - 1...Sg6
    - 2.Sd6#
  - 1...Sc8
    - 2.Qxh7#
  - 1...Sg8
    - 2.Qxh7#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 5
- REMOVED MATES = 3
Sets
- R(j);N_GUARD::R1(H),XR(j)
- R(j);N_GUARD,XS(I)::R1(H)
- R(j);N_GUARD::R1(H)
- S(d);::B(A)+S(E),DCHECK
- S(d);OGATE,XP(G)::QAR1(C),XS(d)
- S(h);SBLOCK::S(E)
Tries
- Try
  - Q(C);
  - Threat
    - DUALS(2)
  - Vars
    - R(j);N_GUARD::R1(H),XR(j)
    - P(b);::QAB(C)
    - P(f);::QAB(C)
    - Q(a);::QAB(C)
    - S(h);::S(E)
  - Refutation
    - S(h);
Actual
- Q(C);
- Threat
  - QAB(C)
- Vars
  - R(j);N_GUARD,XS(I)::R1(H)
  - S(d);OGATE,XP(G)::QAR1(C),XS(d)
  - R(j);N_GUARD::R1(H),XR(j)
  - S(h);OGATE::QAB(C),XR(i)
  - S(d);::B(A)+S(E),DCHECK
  - S(d);SBLOCK::B(A)+S(E),DCHECK
  - S(h);SBLOCK::S(E)

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).