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Problem Display

PID: 193864 (8/8/8/kBP5/P1Q5/8/2n5/2K5 w - - 0 1)

Meyer, Heinrich Friedrich Ludwig

Chess Amateur (The), 1916

8/8/8/kBP5/P1Q5/8/2n5/2K5

#2

5 + 2

5454	Near Snap	2019
6490	yacpdb	2019

SOLUTION

SOUND
Sets
- 1...Sa1
  - 2.Qc3#
- 1...Se1
  - 2.Qc3#
- 1...Sa3
  - 2.Qc3#
- 1...Se3
  - 2.Qc3#
- 1...Sd4
  - 2.Qc3#
Tries
- 1.Kb2?
  - 1...Sa1
    - 2.Qc3#
  - 1...Se1
    - 2.Qc3#
  - 1...Sa3
    - 2.Qc3#
  - 1...Se3
    - 2.Qc3#
  - 1...Sd4
    - 2.Qc3#
  - 1...Sb4!
- 1.Kd2?
  - 1...Sa1
    - 2.Qc3#
  - 1...Se1
    - 2.Qc3#
  - 1...Sa3
    - 2.Qc3#
  - 1...Se3
    - 2.Qc3#
  - 1...Sd4
    - 2.Qc3#
  - 1...Sb4!
- 1.Qb3?
  - 1...Sa1
    - 2.Qc3#
  - 1...Se1
    - 2.Qc3#
  - 1...Sa3
    - 2.Qc3#
  - 1...Se3
    - 2.Qc3#
  - 1...Sd4
    - 2.Qc3#
  - 1...Sb4!
- 1.Qd3?
  - 1...Sb4
    - 2.Qd8#
  - 1...Sa1
    - 2.Qd2#
    - 2.Qc3#
  - 1...Se1
    - 2.Qd2#
    - 2.Qc3#
  - 1...Sa3
    - 2.Qd2#
    - 2.Qc3#
  - 1...Se3
    - 2.Qd2#
    - 2.Qc3#
  - 1...Sd4
    - 2.Qd2#
    - 2.Qc3#
  - 1...Kb4!
- 1.Qd4?
  - 1...Sb4
    - 2.Qd8#
  - 1...Sa1
    - 2.Qc3#
    - 2.Qd2#
  - 1...Se1
    - 2.Qc3#
    - 2.Qd2#
  - 1...Sa3
    - 2.Qc3#
    - 2.Qd2#
  - 1...Se3
    - 2.Qc3#
    - 2.Qd2#
  - 1...Sxd4!
- 1.Qf4?
  - 1...Sd4
    - 2.Qd2#
  - 1...Sb4
    - 2.Qc7#
  - 1...Sa1
    - 2.Qd2#
  - 1...Se1
    - 2.Qd2#
  - 1...Sa3
    - 2.Qd2#
  - 1...Se3!
Keys
- 1.Qh4!
  - 1...Sd4
    - 2.Qe1#
  - 1...Sb4
    - 2.Qd8#
  - 1...Sa1
    - 2.Qe1#
  - 1...Se1
    - 2.Qxe1#
  - 1...Sa3
    - 2.Qe1#
  - 1...Se3
    - 2.Qe1#

Anticipated by 2803(0000)

This anticipates 10715(1967), 29792(1994)

FEATURES

Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 5
- ADDED MATES = 1
- REMOVED MATES = 0
Sets
- S(a);N_GUARD::QAB(C)
Tries
- Try
  - K(A);S_FLIGHT
  - Vars
    - S(a);N_GUARD::QAB(C)
  - Refutation
    - S(a);
- Try
  - K(A);S_FLIGHT
  - Vars
    - S(a);N_GUARD::QAB(C)
  - Refutation
    - S(a);
- Try
  - Q(C);
  - Vars
    - S(a);N_GUARD::QAB(C)
  - Refutation
    - S(a);
- Try
  - Q(C);
  - Vars
    - S(a);SBLOCK::QAB(C)
  - Refutation
    - K(b);S_FLIGHT
- Try
  - Q(C);
  - Vars
    - S(a);SBLOCK::QAB(C)
  - Refutation
    - S(a);XQ(C)
- Try
  - Q(C);
  - Vars
    - S(a);N_GUARD::QAB(C)
    - S(a);SBLOCK::QAB(C)
  - Refutation
    - S(a);
Actual
- Q(C);
- Vars
  - S(a);N_GUARD::QAB(C)
  - S(a);SBLOCK::QAB(C)
  - S(a);N_GUARD::QAB(C),XS(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).