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Problem Display

PID: 240492 (q7/p7/7B/1Np1pB2/4P3/3k4/Q6K/8 w - - 0 1)

Pilchenko, Viacheslav Karlovich

Schakend Nederland, 1987

q7/p7/7B/1Np1pB2/4P3/3k4/Q6K/8

#2

6 + 5

15148	Sadier Collection	2021

SOLUTION

SOUND
Sets
- 1...c4
  - 2.Qd2#
Tries
- 1.Sa3?
  - threat
    - 2.Qc4#
    - 2.Qd2#
  - 1...Kd4
    - 2.Qc4#
    - 2.Qd2#
  - 1...Qd5
    - 2.Qd2#
  - 1...Qg8
    - 2.Qd2#
  - 1...c4
    - 2.Qxc4#
    - 2.Qd2#
  - 1...Kc3!
- 1.Sd6?
  - threat
    - 2.Qc4#
    - 2.Qd2#
  - 1...Kd4
    - 2.Qc4#
    - 2.Qd2#
  - 1...Qd5
    - 2.Qd2#
  - 1...Qg8
    - 2.Qd2#
  - 1...c4
    - 2.Qxc4#
    - 2.Qd2#
  - 1...Kc3!
- 1.Be6?
  - threat
    - 2.Qc4#
  - 1...Kxe4
    - 2.Qe2#
  - 1...Qxe4
    - 2.Qd2#
  - 1...c4
    - 2.Qxc4#
  - 1...Qd5!
Keys
- 1.Bg4!
  - threat
    - 2.Qe2#
  - 1...Kxe4
    - 2.Qc4#
  - 1...Qxe4
    - 2.Qb3#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 1
Sets
- P(b);SBLOCK::QAR1(A)
Tries
- Try
  - S(D);
  - Threat
    - DUALS(2)
  - Vars
    - Q(e);::QAR1(A)
  - Refutation
    - K(a);P-FLIGHT
- Try
  - S(D);
  - Threat
    - DUALS(2)
  - Vars
    - Q(e);::QAR1(A)
  - Refutation
    - K(a);P-FLIGHT
- Try
  - B(E);
  - Threat
    - QAB1(A)
  - Vars
    - K(a);S_FLIGHT,XP(C)::QAR2(A)
    - Q(e);SBLOCK,XP(C)::QAR1(A)
    - P(b);::QAB1(A),XP(b)
  - Refutation
    - Q(e);
Actual
- B(E);
- Threat
  - QAB1(A)
- Vars
  - K(a);S_FLIGHT,XP(C)::QAR2(A)
  - Q(e);SBLOCK,XP(C)::QAR2(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).