MESON Chess Problem Database
Problem Display
PID: 6129 (n7/4p3/N2p3p/KPpkp2P/3bN1Q1/1Pp5/2P5/8 w - - 0 1)
Sonnenfeld, Pal
4th HM., Grantham Journal, 1927
#2
8 + 9
SOLUTION
- SOUND
- Sets
- 1...Bg1
- 2.Sxc3#
- 1...Bf2
- 2.Sxc3#
- 1...Be3
- 2.Sxc3#
- 1...Sb6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...c4
- 2.Sb4#
- 1...e6
- 2.Sf6#
- 1...Bg1
- Tries
- 1.Ka4?
- 1...Bg1
- 2.Sxc3#
- 1...Bf2
- 2.Sxc3#
- 1...Be3
- 2.Sxc3#
- 1...Sc7
- 2.Sxc7#
- 1...c4
- 2.Sb4#
- 1...e6
- 2.Sf6#
- 1...Sb6+!
- 1...Bg1
- 1.Sf2?
- 1...Bxf2
- 2.Qc4#
- 1...e4
- 2.Qxe4#
- 1...Be3
- 2.Qc4#
- 1...Sb6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...e6
- 2.Qe4#
- 1...c4!
- 1...Bxf2
- 1.Sg3?
- 1...e4
- 2.Qxe4#
- 1...Bg1
- 2.Qc4#
- 1...Bf2
- 2.Qc4#
- 1...Be3
- 2.Qc4#
- 1...Sb6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...e6
- 2.Qe4#
- 1...c4!
- 1...e4
- 1.Sexc5?
- threat
- 2.Qe6#
- 2.Qe4#
- 1...Bxc5
- 2.Qc4#
- 1...e4
- 2.Qe6#
- 2.Qxe4#
- 1...Bg1
- 2.Qc4#
- 2.Qe4#
- 1...Bf2
- 2.Qc4#
- 2.Qe4#
- 1...Be3
- 2.Qc4#
- 2.Qe4#
- 1...Sc7
- 2.Qe4#
- 1...e6
- 2.Qxe6#
- 2.Qe4#
- 1...dxc5!
- threat
- 1.Sg5?
- threat
- 2.Qe6#
- 2.Qe4#
- 1...e4
- 2.Qe6#
- 2.Qxe4#
- 1...Bg1
- 2.Qc4#
- 2.Qe4#
- 1...Bf2
- 2.Qc4#
- 2.Qe4#
- 1...Be3
- 2.Qc4#
- 2.Qe4#
- 1...Sc7
- 2.Sxc7#
- 2.Qe4#
- 1...e6
- 2.Qxe6#
- 2.Qe4#
- 1...hxg5!
- threat
- 1.Qg8+?
- 1...e6
- 2.Sf6#
- 2.Qxa8#
- 1...Kxe4!
- 1...e6
- 1.Ka4?
- Keys
- 1.Sd2!
- 1...cxd2
- 2.c4#
- 1...e4
- 2.Qxe4#
- 1...Bg1
- 2.Qc4#
- 1...Bf2
- 2.Qc4#
- 1...Be3
- 2.Qc4#
- 1...Sb6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...c4
- 2.bxc4#
- 1...e6
- 2.Qe4#
- 1...cxd2
- 1.Sd2!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 5
- ADDED MATES = 2
- REMOVED MATES = 0
- Sets
- B(b);N_GUARD::S(C),XP(a)
- S(i);N_GUARD::S(H)
- S(i);N_GUARD::S(H),XS(i)
- P(c);N_GUARD::S(H)
- P(h);N_GUARD::S(C)
- Tries
- Try
- K(E);P-FLIGHT
- Vars
- B(b);N_GUARD::S(C),XP(a)
- S(i);N_GUARD::S(H),XS(i)
- P(c);N_GUARD::S(H)
- P(h);N_GUARD::S(C)
- Refutation
- S(i);CHECK
- Try
- S(C);
- Vars
- B(b);OGATE,XS(C)::QAB1(D)
- P(e);::QAB1(D),XP(e)
- B(b);OGATE::QAB1(D)
- S(i);N_GUARD::S(H)
- S(i);N_GUARD::S(H),XS(i)
- P(h);SBLOCK::QAB1(D)
- Refutation
- P(c);
- Try
- S(C);
- Vars
- P(e);::QAB1(D),XP(e)
- B(b);OGATE::QAB1(D)
- S(i);N_GUARD::S(H)
- S(i);N_GUARD::S(H),XS(i)
- P(h);SBLOCK::QAB1(D)
- Refutation
- P(c);
- Try
- S(C);XP(c)
- Threat
- DUALS(2)
- Vars
- B(b);OGATE,XS(C)::QAB1(D)
- S(i);::QAB1(D)
- Refutation
- P(f);XS(C)
- Try
- S(C);
- Threat
- DUALS(2)
- Refutation
- P(g);XS(C)
- Try
- Q(D);CHECK
- Refutation
- K(d);S_FLIGHT,XS(C)
- Try
- Actual
- S(C);
- Vars
- P(a);OGATE,XS(C)::P(A)
- P(e);::QAB1(D),XP(e)
- B(b);OGATE::QAB1(D)
- S(i);N_GUARD::S(H)
- S(i);N_GUARD::S(H),XS(i)
- P(c);OGATE::P(B),XP(c)
- P(h);SBLOCK::QAB1(D)
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).