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Problem Display

PID: 234476 (4Q1K1/B1p2B2/3k4/8/5n2/8/8/8 w - - 0 1)

Makaronets, Leonid

L'Italia Scacchistica, 1999

4Q1K1/B1p2B2/3k4/8/5n2/8/8/8

#2

4 + 3

15148	Sadier Collection	2021
5454	Near Snap	2022

SOLUTION

SOUND
Sets
- 1...Se2
  - 2.Qe6#
- 1...Sg2
  - 2.Qe6#
- 1...Sd3
  - 2.Qe6#
- 1...Sh3
  - 2.Qe6#
- 1...Sd5
  - 2.Qe6#
- 1...Sh5
  - 2.Qe6#
- 1...Se6
  - 2.Qxe6#
- 1...Sg6
  - 2.Qe6#
- 1...c5
  - 2.Bb8#
Tries
- 1.Kh7?
  - 1...Se6
    - 2.Qxe6#
  - 1...c5
    - 2.Bb8#
  - 1...Se2
    - 2.Qe6#
  - 1...Sg2
    - 2.Qe6#
  - 1...Sd3
    - 2.Qe6#
  - 1...Sh3
    - 2.Qe6#
  - 1...Sd5
    - 2.Qe6#
  - 1...Sh5
    - 2.Qe6#
  - 1...Sg6
    - 2.Qe6#
  - 1...c6!
- 1.Kf8?
  - 1...Se6+
    - 2.Qxe6#
  - 1...c5
    - 2.Bb8#
  - 1...c6
    - 2.Qe7#
  - 1...Se2
    - 2.Qe6#
  - 1...Sg2
    - 2.Qe6#
  - 1...Sd3
    - 2.Qe6#
  - 1...Sh3
    - 2.Qe6#
  - 1...Sd5
    - 2.Qe6#
  - 1...Sh5
    - 2.Qe6#
  - 1...Sg6+!
- 1.Be3?
  - 1...Se6
    - 2.Qxe6#
  - 1...c5
    - 2.Bxf4#
  - 1...Se2
    - 2.Qe6#
  - 1...Sg2
    - 2.Qe6#
  - 1...Sd3
    - 2.Qe6#
  - 1...Sh3
    - 2.Qe6#
  - 1...Sd5
    - 2.Qe6#
  - 1...Sh5
    - 2.Qe6#
  - 1...Sg6
    - 2.Qe6#
  - 1...c6!
Keys
- 1.Bd4!
  - 1...Se6
    - 2.Qxe6#
  - 1...c5
    - 2.Be5#
  - 1...c6
    - 2.Qd8#
  - 1...Se2
    - 2.Qe6#
  - 1...Sg2
    - 2.Qe6#
  - 1...Sd3
    - 2.Qe6#
  - 1...Sh3
    - 2.Qe6#
  - 1...Sd5
    - 2.Qe6#
  - 1...Sh5
    - 2.Qe6#
  - 1...Sg6
    - 2.Qe6#

Anticipated by 161353(1996)

FEATURES

Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 1
- ADDED MATES = 1
- REMOVED MATES = 0
Sets
- S(a);N_GUARD::QAR1(C)
- S(a);N_GUARD::QAR1(C),XS(a)
- P(c);OGATEB,SBLOCK::B(A)
Tries
- Try
  - K(D);S_FLIGHT
  - Vars
    - S(a);N_GUARD::QAR1(C),XS(a)
    - P(c);OGATEB,SBLOCK::B(A)
    - S(a);N_GUARD::QAR1(C)
  - Refutation
    - P(c);
- Try
  - K(D);P-FLIGHT
  - Vars
    - S(a);CHECK,N_GUARD::QAR1(C),XS(a)
    - P(c);OGATEB,SBLOCK::B(A)
    - P(c);SBLOCK::QAB1(C)
    - S(a);N_GUARD::QAR1(C)
  - Refutation
    - S(a);CHECK
- Try
  - B(A);
  - Vars
    - S(a);N_GUARD::QAR1(C),XS(a)
    - P(c);SBLOCK::B(A),XS(a)
    - S(a);N_GUARD::QAR1(C)
  - Refutation
    - P(c);
Actual
- B(A);
- Vars
  - S(a);N_GUARD::QAR1(C),XS(a)
  - P(c);SBLOCK::B(A)
  - P(c);SBLOCK::QAR2(C)
  - S(a);N_GUARD::QAR1(C)

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).