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Problem Display

PID: 85701 (3k4/3P4/N2R2n1/8/8/2K5/8/3Q4 w - - 0 1)

Speckmann, Werner

Die Welt, 1989

3k4/3P4/N2R2n1/8/8/2K5/8/3Q4

#2

5 + 2

6490	yacpdb	2009

SOLUTION

SOUND
Tries
- 1.Qf3?
  - 1...Ke7
    - 2.Qf6#
    - 2.d8Q#
  - 1...Sh4
    - 2.Qf6#
    - 2.Qf8#
  - 1...Se5
    - 2.Qf6#
    - 2.Qf8#
  - 1...Se7
    - 2.Qf8#
  - 1...Sf8
    - 2.Qf6#
    - 2.Qxf8#
  - 1...Sh8
    - 2.Qf6#
    - 2.Qf8#
  - 1...Sf4!
- 1.Qh5?
  - 1...Sf4
    - 2.Qe8#
    - 2.Qh4#
    - 2.Qg5#
  - 1...Sh4
    - 2.Qe8#
    - 2.Qxh4#
    - 2.Qg5#
  - 1...Se5
    - 2.Qe8#
    - 2.Qh4#
    - 2.Qg5#
  - 1...Se7
    - 2.Qe8#
    - 2.Qa5#
  - 1...Sf8
    - 2.Qe8#
    - 2.Qh4#
    - 2.Qg5#
  - 1...Sh8
    - 2.Qe8#
    - 2.Qh4#
    - 2.Qg5#
  - 1...Ke7!
- 1.Qe1?
  - threat
    - 2.Qe8#
  - 1...Se5
    - 2.Qh4#
  - 1...Se7!
- 1.Qf1?
  - 1...Ke7
    - 2.Qf6#
    - 2.d8Q#
  - 1...Sh4
    - 2.Qf6#
    - 2.Qf8#
  - 1...Se5
    - 2.Qf6#
    - 2.Qf8#
  - 1...Se7
    - 2.Qf8#
  - 1...Sf8
    - 2.Qf6#
    - 2.Qxf8#
  - 1...Sh8
    - 2.Qf6#
    - 2.Qf8#
  - 1...Sf4!
- 1.Qg1?
  - 1...Sf4
    - 2.Qg5#
  - 1...Sh4
    - 2.Qg5#
  - 1...Se5
    - 2.Qg5#
  - 1...Se7
    - 2.Qb6#
  - 1...Sf8
    - 2.Qg5#
  - 1...Sh8
    - 2.Qg5#
  - 1...Ke7!
- 1.Qd5?
  - 1...Ke7
    - 2.d8Q#
  - 1...Sf4
    - 2.Qg5#
  - 1...Sh4
    - 2.Qg5#
  - 1...Se7
    - 2.Qa5#
  - 1...Sf8
    - 2.Qg5#
  - 1...Sh8
    - 2.Qg5#
  - 1...Se5!
Keys
- 1.Qd4!
  - 1...Ke7
    - 2.Qf6#
  - 1...Sf4
    - 2.Qf6#
  - 1...Sh4
    - 2.Qf6#
    - 2.Qxh4#
  - 1...Se5
    - 2.Qh4#
  - 1...Se7
    - 2.Qb6#
  - 1...Sf8
    - 2.Qf6#
    - 2.Qh4#
  - 1...Sh8
    - 2.Qf6#
    - 2.Qh4#

FEATURES

Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 0
Sets
Tries
- Try
  - Q(A);
  - Vars
    - S(a);N_GUARD::QAR2(A)
  - Refutation
    - S(a);
- Try
  - Q(A);
  - Refutation
    - K(b);S_FLIGHT
- Try
  - Q(A);
  - Threat
    - QAR1(A)
  - Vars
    - S(a);N_GUARD::QAB(A)
  - Refutation
    - S(a);
- Try
  - Q(A);
  - Vars
    - S(a);N_GUARD::QAR2(A)
  - Refutation
    - S(a);
- Try
  - Q(A);
  - Vars
    - S(a);N_GUARD::QAB(A)
    - S(a);SBLOCK::QAB(A)
  - Refutation
    - K(b);S_FLIGHT
- Try
  - Q(A);
  - Vars
    - K(b);OGATE,S_FLIGHT::P=Q
    - S(a);N_GUARD::QAB(A)
    - S(a);SBLOCK::QAB(A)
  - Refutation
    - S(a);
Actual
- Q(A);
- Vars
  - K(b);S_FLIGHT::QAB1(A)
  - S(a);N_GUARD::QAB(A)
  - S(a);SBLOCK::QAB(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).