Meson Chess Problem Database

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Problem Display

PID: 204264 (8/8/8/7K/8/4Q1N1/3Pp3/3qk3 w - - 0 1)

Lazard, Frederic

La Strategie, 1925

8/8/8/7K/8/4Q1N1/3Pp3/3qk3

#2

4 + 3

6490	yacpdb	2020

SOLUTION

SOUND
Sets
- 1...Qc2
  - 2.Qxe2#
- 1...Qb3
  - 2.Qxe2#
- 1...Qa4
  - 2.Qxe2#
- 1...Qa1
  - 2.Qxe2#
- 1...Qb1
  - 2.Qxe2#
- 1...Qc1
  - 2.Qxe2#
- 1...Qxd2
  - 2.Qg1#
Tries
- 1.Kg4?
  - 1...Qxd2
    - 2.Qg1#
  - 1...Qc2
    - 2.Qxe2#
  - 1...Qb3
    - 2.Qxe2#
  - 1...Qa1
    - 2.Qxe2#
  - 1...Qb1
    - 2.Qxe2#
  - 1...Qc1
    - 2.Qxe2#
  - 1...Qa4+!
- 1.Kh4?
  - 1...Qxd2
    - 2.Qg1#
  - 1...Qc2
    - 2.Qxe2#
  - 1...Qb3
    - 2.Qxe2#
  - 1...Qa1
    - 2.Qxe2#
  - 1...Qb1
    - 2.Qxe2#
  - 1...Qc1
    - 2.Qxe2#
  - 1...Qa4+!
- 1.Kg5?
  - 1...Qc2
    - 2.Qxe2#
  - 1...Qb3
    - 2.Qxe2#
  - 1...Qa4
    - 2.Qxe2#
  - 1...Qa1
    - 2.Qxe2#
  - 1...Qb1
    - 2.Qxe2#
  - 1...Qc1
    - 2.Qxe2#
  - 1...Qxd2!
- 1.Kh6?
  - 1...Qc2
    - 2.Qxe2#
  - 1...Qb3
    - 2.Qxe2#
  - 1...Qa4
    - 2.Qxe2#
  - 1...Qa1
    - 2.Qxe2#
  - 1...Qb1
    - 2.Qxe2#
  - 1...Qc1
    - 2.Qxe2#
  - 1...Qxd2!
Keys
- 1.Se4!
  - threat
    - 2.Qg1#
    - 2.Qf2#
  - 1...Kf1
    - 2.Qf2#
  - 1...Qxd2
    - 2.Qg1#
  - 1...Qc2
    - 2.Qg1#
  - 1...Qb3
    - 2.Qg1#
  - 1...Qa4
    - 2.Qg1#
  - 1...Qa1
    - 2.Qg1#
  - 1...Qb1
    - 2.Qg1#
  - 1...Qc1
    - 2.Qg1#

FEATURES

Static
- TYPE = BLOCK_THREAT
- CHANGED MATES = 6
- ADDED MATES = 1
- REMOVED MATES = 0
Sets
- Q(a);N_GUARD::QAR1(B),XP(c)
- Q(a);SBLOCK,XP(A)::QAR2(B)
Tries
- Try
  - K(D);S_FLIGHT
  - Vars
    - Q(a);SBLOCK,XP(A)::QAR2(B)
    - Q(a);N_GUARD::QAR1(B),XP(c)
  - Refutation
    - Q(a);CHECK
- Try
  - K(D);P-FLIGHT
  - Vars
    - Q(a);SBLOCK,XP(A)::QAR2(B)
    - Q(a);N_GUARD::QAR1(B),XP(c)
  - Refutation
    - Q(a);CHECK
- Try
  - K(D);P-FLIGHT
  - Vars
    - Q(a);N_GUARD::QAR1(B),XP(c)
  - Refutation
    - Q(a);P_PINQ(B),XP(A)
- Try
  - K(D);P-FLIGHT
  - Vars
    - Q(a);N_GUARD::QAR1(B),XP(c)
  - Refutation
    - Q(a);P_PINQ(B),XP(A)
Actual
- S(C);
- Threat
  - DUALS(2)
- Vars
  - K(b);N_SPINP(c),P-FLIGHT::QAR1(B)
  - Q(a);XP(A)::QAR2(B)
  - Q(a);::QAR2(B)

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).