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Problem Display

PID: 79832 (1R2B3/K7/8/k7/8/8/nP6/8 w - - 0 1)

Ahlheim, Karl-Heinz

Deutsche Schachzeitung, 1969

1R2B3/K7/8/k7/8/8/nP6/8

#2

4 + 2

15148	Sadier Collection	2014

SOLUTION

SOUND
Sets
- 1...Sc1
  - 2.b4#
- 1...Sc3
  - 2.b4#
Tries
- 1.Bc6?
  - 1...Sc1
    - 2.b4#
  - 1...Sc3
    - 2.b4#
  - 1...Sb4!
- 1.Bd7?
  - 1...Sc1
    - 2.b4#
  - 1...Sc3
    - 2.b4#
  - 1...Sb4!
- 1.Rb6?
  - 1...Sc1
    - 2.b4#
  - 1...Sc3
    - 2.b4#
  - 1...Sb4!
- 1.Rb7?
  - 1...Sc1
    - 2.b4#
  - 1...Sc3
    - 2.b4#
  - 1...Sb4!
Keys
- 1.b3!
  - threat
    - 2.Rb5#
  - 1...Sc3
    - 2.b4#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 1
Sets
- S(a);N_GUARD::P(A)
Tries
- Try
  - B(D);
  - Vars
    - S(a);N_GUARD::P(A)
  - Refutation
    - S(a);
- Try
  - B(D);
  - Vars
    - S(a);N_GUARD::P(A)
  - Refutation
    - S(a);
- Try
  - R(C);
  - Vars
    - S(a);N_GUARD::P(A)
  - Refutation
    - S(a);
- Try
  - R(C);
  - Vars
    - S(a);N_GUARD::P(A)
  - Refutation
    - S(a);
Actual
- P(A);
- Threat
  - R1(C)
- Vars
  - S(a);N_GUARD::P(A)

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).