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Problem Display

PID: 231115 (8/8/4Q3/5p2/2R5/3kb3/8/3K4 w - - 0 1)

Szentgyorgy, Erno

Magyar Sakkvilag, 1927

8/8/4Q3/5p2/2R5/3kb3/8/3K4

#2

3 + 3

6490	yacpdb	2021

SOLUTION

SOUND
Sets
- 1...Bc1
  - 2.Qe2#
- 1...Bg1
  - 2.Qe2#
- 1...Bd2
  - 2.Qe2#
- 1...Bf2
  - 2.Qe2#
- 1...Bd4
  - 2.Qe2#
- 1...Bf4
  - 2.Qe2#
- 1...Bc5
  - 2.Qe2#
- 1...Bg5
  - 2.Qe2#
- 1...Bb6
  - 2.Qe2#
- 1...Bh6
  - 2.Qe2#
- 1...Ba7
  - 2.Qe2#
- 1...f4
  - 2.Qe4#
Tries
- 1.Qd7+?
  - 1...Bd4
    - 2.Qxd4#
  - 1...Kxc4!
- 1.Qe5?
  - threat
    - 2.Rc3#
    - 2.Qc3#
  - 1...Bd2
    - 2.Qd4#
    - 2.Qe2#
  - 1...Bd4
    - 2.Qxd4#
    - 2.Qe2#
  - 1...Kxc4!
- 1.Qd6+?
  - 1...Bd4
    - 2.Qxd4#
  - 1...Kxc4!
- 1.Qf6?
  - threat
    - 2.Qc3#
  - 1...Bd2
    - 2.Qd4#
  - 1...Bd4
    - 2.Qxd4#
  - 1...Kxc4!
- 1.Qe7?
  - 1...Bd2
    - 2.Qe2#
  - 1...Bc1
    - 2.Qe2#
  - 1...Bg1
    - 2.Qe2#
  - 1...Bf2
    - 2.Qe2#
  - 1...Bd4
    - 2.Qe2#
  - 1...Bf4
    - 2.Qe2#
  - 1...Bc5
    - 2.Qe2#
  - 1...Bg5
    - 2.Qe2#
  - 1...Bb6
    - 2.Qe2#
  - 1...Bh6
    - 2.Qe2#
  - 1...Ba7
    - 2.Qe2#
  - 1...f4
    - 2.Qe4#
  - 1...Kxc4!
- 1.Qe8?
  - 1...Bd2
    - 2.Qe2#
  - 1...Bc1
    - 2.Qe2#
  - 1...Bg1
    - 2.Qe2#
  - 1...Bf2
    - 2.Qe2#
  - 1...Bd4
    - 2.Qe2#
  - 1...Bf4
    - 2.Qe2#
  - 1...Bc5
    - 2.Qe2#
  - 1...Bg5
    - 2.Qe2#
  - 1...Bb6
    - 2.Qe2#
  - 1...Bh6
    - 2.Qe2#
  - 1...Ba7
    - 2.Qe2#
  - 1...f4
    - 2.Qe4#
  - 1...Kxc4!
Keys
- 1.Qd5+!
  - 1...Bd4
    - 2.Qxd4#

FEATURES

Static
- TYPE = CHECKING_KEY
- CHANGED MATES = 1
- ADDED MATES = 0
- REMOVED MATES = 11
Sets
- B(b);OGATE::QAB1(C)
- P(c);N_GUARD::QAB1(C)
Tries
- Try
  - Q(C);CHECK
  - Vars
    - B(b);N_GUARD,P_SPINB(b)::QAR1(C),XB(b)
  - Refutation
    - K(a);S_FLIGHT,XR(B)
- Try
  - Q(C);
  - Threat
    - DUALS(2)
  - Refutation
    - K(a);S_FLIGHT,XR(B)
- Try
  - Q(C);CHECK
  - Vars
    - B(b);N_GUARD,P_SPINB(b)::QAR1(C),XB(b)
  - Refutation
    - K(a);S_FLIGHT,XR(B)
- Try
  - Q(C);
  - Threat
    - QAR1(C)
  - Vars
    - B(b);N_GUARD::QAR1(C)
    - B(b);N_GUARD::QAR1(C),XB(b)
  - Refutation
    - K(a);S_FLIGHT,XR(B)
- Try
  - Q(C);
  - Vars
    - B(b);OGATE::QAB1(C)
    - P(c);N_GUARD::QAB1(C)
  - Refutation
    - K(a);S_FLIGHT,XR(B)
- Try
  - Q(C);
  - Vars
    - B(b);OGATE::QAB1(C)
    - P(c);N_GUARD::QAB1(C)
  - Refutation
    - K(a);S_FLIGHT,XR(B)
Actual
- Q(C);CHECK
- Vars
  - B(b);N_GUARD,P_SPINB(b)::QAR1(C),XB(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).