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Problem Display

PID: 206690 (4k3/3Rp3/2P1pbK1/4p3/4P3/3P1Q2/5P2/8 w - - 0 1)

Beck, Gyula

Nepszava, 1925

4k3/3Rp3/2P1pbK1/4p3/4P3/3P1Q2/5P2/8

#2

7 + 5

6490	yacpdb	2020

SOLUTION

SOUND
Sets
- 1...Kf8
  - 2.Rd8#
- 1...Bh4
  - 2.Qf7#
- 1...Bg5
  - 2.Qf7#
- 1...Bg7
  - 2.Qf7#
- 1...Bh8
  - 2.Qf7#
Tries
- 1.Rd4?
  - 1...Kf8
    - 2.Rd8#
  - 1...Bh4
    - 2.Qf7#
  - 1...Bg5
    - 2.Qf7#
  - 1...Bg7
    - 2.Qf7#
  - 1...Bh8
    - 2.Qf7#
  - 1...exd4!
- 1.Rd5?
  - 1...Kf8
    - 2.Rd8#
  - 1...Bh4
    - 2.Qf7#
  - 1...Bg5
    - 2.Qf7#
  - 1...Bg7
    - 2.Qf7#
  - 1...Bh8
    - 2.Qf7#
  - 1...exd5!
- 1.Rd6?
  - 1...Kf8
    - 2.Rd8#
  - 1...Bh4
    - 2.Qf7#
  - 1...Bg5
    - 2.Qf7#
  - 1...Bg7
    - 2.Qf7#
  - 1...Bh8
    - 2.Qf7#
  - 1...exd6!
- 1.Ra7?
  - threat
    - 2.Ra8#
  - 1...Kf8
    - 2.Ra8#
  - 1...Kd8!
- 1.Rb7?
  - threat
    - 2.Rb8#
  - 1...Kf8
    - 2.Rb8#
  - 1...Kd8!
- 1.Rc7?
  - threat
    - 2.Rc8#
  - 1...Kf8
    - 2.Rc8#
  - 1...Kd8!
- 1.Qf4?
  - 1...Kf8
    - 2.Rd8#
  - 1...Bh4
    - 2.Qf7#
  - 1...Bg5
    - 2.Qf7#
  - 1...Bg7
    - 2.Qf7#
  - 1...Bh8
    - 2.Qf7#
  - 1...exf4!
- 1.Qf5?
  - 1...Kf8
    - 2.Rd8#
  - 1...Bh4
    - 2.Qf7#
  - 1...Bg5
    - 2.Qf7#
  - 1...Bg7
    - 2.Qf7#
  - 1...Bh8
    - 2.Qf7#
  - 1...exf5!
- 1.d4?
  - 1...Kf8
    - 2.Rd8#
  - 1...Bh4
    - 2.Qf7#
  - 1...Bg5
    - 2.Qf7#
  - 1...Bg7
    - 2.Qf7#
  - 1...Bh8
    - 2.Qf7#
  - 1...exd4!
- 1.c7?
  - threat
    - 2.Rd8#
    - 2.c8Q#
  - 1...Kf8
    - 2.Rd8#
    - 2.c8Q#
    - 2.c8R#
  - 1...Kxd7!
Keys
- 1.Qh5!
  - 1...Kf8
    - 2.Rd8#
  - 1...Bh4
    - 2.Kg7#
    - 2.Qh8#
  - 1...Bg5
    - 2.Kg7#
    - 2.Qh8#
  - 1...Bg7
    - 2.Kxg7#
  - 1...Bh8
    - 2.Qxh8#

FEATURES

Static
- TYPE = MUTATE
- CHANGED MATES = 2
- ADDED MATES = 0
- REMOVED MATES = 2
Sets
- K(e);P-FLIGHT,P_SPINB(c)::R(G)
- B(c);OGATE::QAB1(C)
Tries
- Try
  - R(G);
  - Vars
    - K(e);P-FLIGHT,P_SPINB(c)::R(G)
    - B(c);OGATE::QAB1(C)
  - Refutation
    - P(a);XR(G)
- Try
  - R(G);
  - Vars
    - K(e);P-FLIGHT,P_SPINB(c)::R(G)
    - B(c);OGATE::QAB1(C)
  - Refutation
    - P(b);XR(G)
- Try
  - R(G);
  - Vars
    - K(e);P-FLIGHT,P_SPINB(c)::R(G)
    - B(c);OGATE::QAB1(C)
  - Refutation
    - P(d);XR(G)
- Try
  - R(G);
  - Threat
    - R(G)
  - Vars
    - K(e);P-FLIGHT,P_SPINB(c)::R(G)
  - Refutation
    - K(e);P-FLIGHT
- Try
  - R(G);
  - Threat
    - R(G)
  - Vars
    - K(e);P-FLIGHT,P_SPINB(c)::R(G)
  - Refutation
    - K(e);P-FLIGHT
- Try
  - R(G);
  - Threat
    - R(G)
  - Vars
    - K(e);P-FLIGHT,P_SPINB(c)::R(G)
  - Refutation
    - K(e);P-FLIGHT
- Try
  - Q(C);
  - Vars
    - K(e);P-FLIGHT,P_SPINB(c)::R(G)
    - B(c);OGATE::QAB1(C)
  - Refutation
    - P(a);XQ(C)
- Try
  - Q(C);
  - Vars
    - K(e);P-FLIGHT,P_SPINB(c)::R(G)
    - B(c);OGATE::QAB1(C)
  - Refutation
    - P(b);XQ(C)
- Try
  - P(B);
  - Vars
    - K(e);P-FLIGHT,P_SPINB(c)::R(G)
    - B(c);OGATE::QAB1(C)
  - Refutation
    - P(a);XP(B)
- Try
  - P(E);
  - Threat
    - DUALS(2)
  - Refutation
    - K(e);S_FLIGHT,XR(G)
Actual
- Q(C);
- Vars
  - K(e);P-FLIGHT::R(G)
  - B(c);::QAB(C)+K(F),XB(c)
  - B(c);N_GUARD::QAR(C),XB(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).