MESON Chess Problem Database
Problem Display
PID: 56305 (8/4N3/6p1/nB2N1P1/3Bk1KR/6p1/3Rp1qp/4n2Q w - - 0 1)
O'Keefe, John James
6th Comm., Brisbane Courier, 1916
#2
9 + 8
SOLUTION
- SOUND
- Sets
- 1...Qxh1
- 2.Kxg3#
- 2.Kh3#
- 1...Qf3+
- 2.Kh3#
- 1...Sc2
- 2.Qxg2#
- 1...Sf3
- 2.Qb1#
- 1...Sb3
- 2.Bc6#
- 1...Sc4
- 2.Bc6#
- 1...Sc6
- 2.Bxc6#
- 1...Sb7
- 2.Bc6#
- 1...Qxh1
- Tries
- 1.Sc4?
- threat
- 2.Sd6#
- 1...Qf3+
- 2.Kh3#
- 1...Sxc4
- 2.Bc6#
- 1...Sb7
- 2.Bc6#
- 1...Sd3!
- threat
- 1.S5c6?
- threat
- 2.Rxe2#
- 1...Qf3+
- 2.Kh3#
- 1...Sxc6
- 2.Bxc6#
- 1...Sc2
- 2.Bd3#
- 2.Qxg2#
- 1...Sf3
- 2.Bd3#
- 2.Qb1#
- 1...Sc4!
- threat
- 1.S5xg6?
- 1...Qf3+
- 2.Kh3#
- 1...Qxh1
- 2.Kxg3#
- 1...Sc2
- 2.Qxg2#
- 1...Sf3
- 2.Qb1#
- 1...Sb3
- 2.Bc6#
- 1...Sc4
- 2.Bc6#
- 1...Sc6
- 2.Bxc6#
- 1...Sb7
- 2.Bc6#
- 1...Sd3!
- 1...Qf3+
- 1.Sd7?
- threat
- 2.Sc5#
- 2.Sf6#
- 1...Qf3+
- 2.Kh3#
- 1...Sb3
- 2.Sf6#
- 2.Bc6#
- 1...Sb7
- 2.Sf6#
- 2.Bc6#
- 1...Sd3!
- threat
- 1.Sf7?
- threat
- 2.Sd6#
- 1...Qf3+
- 2.Kh3#
- 1...Sc4
- 2.Bc6#
- 1...Sb7
- 2.Bc6#
- 1...Sd3!
- threat
- 1.Ba4?
- 1...Qf3+
- 2.Kh3#
- 1...Qxh1
- 2.Kxg3#
- 2.Kh3#
- 1...Sc2
- 2.Bxc2#
- 2.Qxg2#
- 1...Sf3
- 2.Bc2#
- 2.Qb1#
- 1...Sb3
- 2.Bc6#
- 1...Sc4
- 2.Bc6#
- 1...Sc6
- 2.Bxc6#
- 1...Sb7
- 2.Bc6#
- 1...Sd3!
- 1...Qf3+
- 1.Bd7?
- 1...Qf3+
- 2.Kh3#
- 1...Qxh1
- 2.Kxg3#
- 2.Kh3#
- 1...Sc2
- 2.Qxg2#
- 1...Sf3
- 2.Qb1#
- 1...Sb3
- 2.Bc6#
- 1...Sc4
- 2.Bc6#
- 1...Sc6
- 2.Bxc6#
- 1...Sb7
- 2.Bc6#
- 1...Sd3!
- 1...Qf3+
- 1.Be8?
- threat
- 2.Bxg6#
- 1...Qf3+
- 2.Kh3#
- 1...Sd3!
- threat
- 1.Qxg2+?
- 1...Sf3
- 2.Kxg3#
- 2.Kh3#
- 2.Qxf3#
- 2.Qxe2#
- 1...Sxg2!
- 1...Sf3
- 1.Sc4?
- Keys
- 1.Sf3!
- 1...Qxf3+
- 2.Kh3#
- 1...Qh3+
- 2.Kxh3#
- 1...Qxh1
- 2.Kxg3#
- 2.Rxe2#
- 1...Sxf3
- 2.Qb1#
- 1...Qf1
- 2.Kxg3#
- 1...Qg1
- 2.Kh3#
- 1...Qf2
- 2.Kh3#
- 1...Sc2
- 2.Bd3#
- 1...Sd3
- 2.Bxd3#
- 1...Sb3
- 2.Bc6#
- 1...Sc4
- 2.Bc6#
- 1...Sc6
- 2.Bxc6#
- 1...Sb7
- 2.Bc6#
- 1...Qxf3+
- 1.Sf3!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 1
- ADDED MATES = 5
- REMOVED MATES = 0
- Sets
- Q(c);CHECK::R(E)+K(D)
- S(a);N_GUARD::QAB(A),XQ(c)
- S(a);N_SPINQ(c),OGATE::QAB(A)
- S(g);N_GUARD::B(F)
- S(g);N_GUARD::B(F),XS(g)
- Tries
- Try
- S(G);
- Threat
- S(G)
- Vars
- Q(c);CHECK::R(E)+K(D)
- S(g);N_GUARD,XS(G)::B(F)
- S(g);N_GUARD::B(F)
- Refutation
- S(a);
- Try
- S(G);
- Threat
- R(B),XP(b)
- Vars
- Q(c);CHECK::R(E)+K(D)
- S(g);OGATE,XS(G)::B(F),XS(g)
- Refutation
- S(g);
- Try
- S(G);XP(h)
- Vars
- Q(c);CHECK::R(E)+K(D)
- Q(c);N_SPINQ(c),XQ(A)::R(E)+K(D),XP(e)
- S(a);N_GUARD::QAB(A),XQ(c)
- S(a);N_SPINQ(c),OGATE::QAB(A)
- S(g);N_GUARD::B(F)
- S(g);N_GUARD::B(F),XS(g)
- Refutation
- S(a);
- Try
- S(G);
- Threat
- DUALS(2)
- Vars
- Q(c);CHECK::R(E)+K(D)
- Refutation
- S(a);
- Try
- S(G);
- Threat
- S(G)
- Vars
- Q(c);CHECK::R(E)+K(D)
- S(g);N_GUARD::B(F)
- Refutation
- S(a);
- Try
- B(F);
- Vars
- Q(c);CHECK::R(E)+K(D)
- S(g);N_GUARD::B(F)
- S(g);N_GUARD::B(F),XS(g)
- Refutation
- S(a);
- Try
- B(F);
- Vars
- Q(c);CHECK::R(E)+K(D)
- S(a);N_GUARD::QAB(A),XQ(c)
- S(a);N_SPINQ(c),OGATE::QAB(A)
- S(g);N_GUARD::B(F)
- S(g);N_GUARD::B(F),XS(g)
- Refutation
- S(a);
- Try
- B(F);
- Threat
- B(F),XP(h)
- Vars
- Q(c);CHECK::R(E)+K(D)
- Refutation
- S(a);
- Try
- Q(A);CHECK,XQ(c)
- Refutation
- S(a);XQ(A)
- Try
- Actual
- S(G);N_PINQ(c)
- Vars
- Q(c);CHECK,P_SPINQ(c),XS(G)::R(E)+K(D)
- Q(c);CHECK::R(E)+K(D),XQ(c)
- S(a);OGATE,XS(G)::QAB(A)
- Q(c);::R(E)+K(D),XP(e)
- Q(c);::R(E)+K(D)
- S(a);N_GUARD::B(F)
- S(a);N_GUARD::B(F),XS(a)
- S(g);N_GUARD::B(F)
- S(g);N_GUARD::B(F),XS(g)
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).