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Problem Display

PID: 200423 (8/8/K2n4/3Q4/p2P4/P4B1N/3p2N1/5k2 w - - 0 1)

Markovtsy, Vassyl Yuriovich

Sachova skladba, 1999

8/8/K2n4/3Q4/p2P4/P4B1N/3p2N1/5k2

#2

7 + 4

5454	Near Snap	2020

SOLUTION

SOUND
Sets
- 1...Sc4
  - 2.Qxc4#
- 1...Se4
  - 2.Qc4#
  - 2.Qb5#
- 1...Sb5
  - 2.Qc4#
  - 2.Qxb5#
- 1...Sf5
  - 2.Qc4#
  - 2.Qb5#
- 1...Sb7
  - 2.Qc4#
  - 2.Qb5#
- 1...Sf7
  - 2.Qc4#
  - 2.Qb5#
- 1...Sc8
  - 2.Qc4#
  - 2.Qb5#
- 1...Se8
  - 2.Qc4#
  - 2.Qb5#
Tries
- 1.Qb3?
  - threat
    - 2.Qd1#
    - 2.Qd3#
  - 1...d1Q
    - 2.Qxd1#
  - 1...d1S
    - 2.Qxd1#
    - 2.Qd3#
  - 1...d1B
    - 2.Qxd1#
  - 1...d1R
    - 2.Qxd1#
  - 1...axb3!
- 1.Qe6?
  - threat
    - 2.Qe2#
  - 1...d1B
    - 2.Qe1#
  - 1...Se4
    - 2.Qc4#
  - 1...d1Q!
- 1.Qa5?
  - 1...d1Q
    - 2.Se3#
  - 1...d1S
    - 2.Qe1#
  - 1...d1B
    - 2.Se3#
    - 2.Qe1#
  - 1...d1R
    - 2.Se3#
  - 1...Se4
    - 2.Qb5#
  - 1...Sb5
    - 2.Qxb5#
  - 1...Sf5
    - 2.Qb5#
  - 1...Sb7
    - 2.Qb5#
  - 1...Sf7
    - 2.Qb5#
  - 1...Sc8
    - 2.Qb5#
  - 1...Se8
    - 2.Qb5#
  - 1...Sc4!
- 1.Qb5+?
  - 1...Sc4
    - 2.Qxc4#
  - 1...Sxb5!
- 1.Qe5?
  - threat
    - 2.Qe2#
  - 1...d1B
    - 2.Qe1#
  - 1...Se4
    - 2.Qb5#
  - 1...d1Q!
Keys
- 1.Qa2!
  - 1...d1Q
    - 2.Qf2#
  - 1...d1S
    - 2.Qe2#
  - 1...d1B
    - 2.Qf2#
  - 1...d1R
    - 2.Qe2#
    - 2.Qf2#
  - 1...Sc4
    - 2.Qxc4#
  - 1...Se4
    - 2.Qc4#
  - 1...Sb5
    - 2.Qc4#
  - 1...Sf5
    - 2.Qc4#
  - 1...Sb7
    - 2.Qc4#
  - 1...Sf7
    - 2.Qc4#
  - 1...Sc8
    - 2.Qc4#
  - 1...Se8
    - 2.Qc4#

Anticipated by 197292(1996), 95364(1999)

FEATURES

Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 10
- REMOVED MATES = 0
Sets
- S(d);N_GUARD::QAB(F),XS(d)
Tries
- Try
  - Q(F);
  - Threat
    - DUALS(2)
  - Vars
    - P(b);::QAR2(F),XQ(b)
    - P(b);::QAR2(F),XB(b)
    - P(b);::QAR2(F),XR(b)
  - Refutation
    - P(c);XQ(F)
- Try
  - Q(F);
  - Threat
    - QAB1(F)
  - Vars
    - P(b);N_GUARD::QAR1(F)
    - S(d);N_GUARD::QAB(F)
  - Refutation
    - P(b);
- Try
  - Q(F);
  - Vars
    - P(b);::S(A)
    - P(b);OGATE::QAR1(F)
    - S(d);N_GUARD::QAB(F)
    - S(d);N_GUARD::QAB(F),XS(d)
  - Refutation
    - S(d);
- Try
  - Q(F);CHECK
  - Vars
    - S(d);N_GUARD,P_SPINS(d)::QAB(F),XS(d)
  - Refutation
    - S(d);XQ(F)
- Try
  - Q(F);
  - Threat
    - QAB1(F)
  - Vars
    - P(b);N_GUARD::QAR1(F)
    - S(d);N_GUARD::QAB(F)
  - Refutation
    - P(b);
Actual
- Q(F);
- Vars
  - P(b);OGATE::QAR1(F)
  - P(b);OGATE::QAB1(F)
  - S(d);N_GUARD::QAB(F),XS(d)
  - S(d);N_GUARD::QAB(F)

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).