Meson Chess Problem Database

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Problem Display

PID: 169978 (2k2K2/8/P1n5/7Q/8/2N3B1/8/8 w - - 0 1)

Lincoln, Robert A

StrateGems, 2017

2k2K2/8/P1n5/7Q/8/2N3B1/8/8

#2

5 + 2

SOLUTION

SOUND
Sets
- 1...Kd7
  - 2.Qe8#
- 1...Kd8
  - 2.Qe8#
- 1...Sb4
  - 2.Qe8#
- 1...Sd4
  - 2.Qe8#
- 1...Sa5
  - 2.Qe8#
- 1...Sa7
  - 2.Qe8#
- 1...Se7
  - 2.Qe8#
- 1...Sb8
  - 2.Qe8#
Tries
- 1.Sa4?
  - 1...Kd7
    - 2.Qe8#
  - 1...Kd8
    - 2.Qe8#
  - 1...Sd8
    - 2.Sb6#
  - 1...Sb4
    - 2.Qe8#
  - 1...Sd4
    - 2.Qe8#
  - 1...Sa5
    - 2.Qe8#
  - 1...Sa7
    - 2.Qe8#
  - 1...Se7
    - 2.Qe8#
  - 1...Sb8
    - 2.Qe8#
  - 1...Se5!
- 1.Sb5?
  - 1...Kd7
    - 2.Qe8#
  - 1...Kd8
    - 2.Qe8#
  - 1...Se5
    - 2.Qe8#
  - 1...Sb4
    - 2.Qe8#
  - 1...Sd4
    - 2.Qe8#
  - 1...Sa5
    - 2.Qe8#
  - 1...Sa7
    - 2.Qe8#
  - 1...Se7
    - 2.Qe8#
  - 1...Sb8
    - 2.Qe8#
  - 1...Sd8!
- 1.Qf7?
  - threat
    - 2.Qc7#
  - 1...Kd8
    - 2.Qe8#
    - 2.Qc7#
  - 1...Se7
    - 2.Qe8#
  - 1...Se5!
- 1.Qe5?
  - threat
    - 2.Qc7#
  - 1...Kd7
    - 2.Qe8#
  - 1...Kd8
    - 2.Qc7#
    - 2.Qe8#
  - 1...Sxe5!
Keys
- 1.Sd5!
  - 1...Kd7
    - 2.Qe8#
  - 1...Kd8
    - 2.Qe8#
  - 1...Se5
    - 2.Qe8#
  - 1...Sd8
    - 2.Sb6#
  - 1...Sb4
    - 2.Qe8#
  - 1...Sd4
    - 2.Qe8#
  - 1...Sa5
    - 2.Qe8#
  - 1...Sa7
    - 2.Qe8#
  - 1...Se7
    - 2.Qe8#
  - 1...Sb8
    - 2.Qe8#

FEATURES

Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 0
Sets
- K(b);S_FLIGHT::QAB1(C)
- K(b);P-FLIGHT::QAR1(C)
- S(a);N_GUARD::QAR2(C)
Tries
- Try
  - S(A);
  - Vars
    - K(b);S_FLIGHT::QAB1(C)
    - K(b);P-FLIGHT::QAR1(C)
    - S(a);SBLOCK::S(A)
    - S(a);N_GUARD::QAR2(C)
  - Refutation
    - S(a);
- Try
  - S(A);
  - Vars
    - K(b);S_FLIGHT::QAB1(C)
    - K(b);P-FLIGHT::QAR1(C)
    - S(a);N_GUARD::QAR2(C)
  - Refutation
    - S(a);
- Try
  - Q(C);
  - Threat
    - QAR1(C)
  - Vars
    - S(a);N_GUARD::QAR2(C)
  - Refutation
    - S(a);
- Try
  - Q(C);
  - Threat
    - QAR1(C)
  - Vars
    - K(b);S_FLIGHT::QAB1(C)
  - Refutation
    - S(a);XQ(C)
Actual
- S(A);
- Vars
  - K(b);S_FLIGHT::QAB1(C)
  - K(b);P-FLIGHT::QAR1(C)
  - S(a);N_GUARD::QAR2(C)
  - S(a);SBLOCK::S(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).