MESON Chess Problem Database
Problem Display
PID: 3047 (8/2p3n1/N1pp3Q/P1Pk1pP1/rp3R2/1n6/2N1RK1p/8 w - - 0 1)
O'Keefe, John James
Smith, William James
Source?, 1917
#2
9 + 10
| 2681 | All Change Here! | 1919 |
SOLUTION
- SOUND
- Sets
- 1...Ra1
- 2.Scxb4#
- 1...Ra2
- 2.Scxb4#
- 1...Ra3
- 2.Scxb4#
- 1...Rxa5
- 2.Scxb4#
- 1...Sa1
- 2.Rd4#
- 1...Sc1
- 2.Rd4#
- 1...Sd2
- 2.Rd4#
- 1...Sd4
- 2.Rxd4#
- 1...Sxa5
- 2.Rd4#
- 1...Sxc5
- 2.Sxc7#
- 2.Rd4#
- 1...Sh5
- 2.Qe6#
- 1...Se6
- 2.Qxe6#
- 1...Se8
- 2.Qe6#
- 1...h1Q
- 2.Qxh1#
- 1...h1S+
- 2.Qxh1#
- 1...h1B
- 2.Qxh1#
- 1...h1R
- 2.Qxh1#
- 1...dxc5
- 2.Sxc7#
- 1...Ra1
- Tries
- 1.Ke1?
- 1...h1Q+
- 2.Qxh1#
- 1...h1R+
- 2.Qxh1#
- 1...Rxa5
- 2.Scxb4#
- 1...Sxa5
- 2.Rd4#
- 1...Sxc5
- 2.Sxc7#
- 2.Rd4#
- 1...dxc5
- 2.Sxc7#
- 1...Sd4
- 2.Rxd4#
- 1...h1S
- 2.Qxh1#
- 1...h1B
- 2.Qxh1#
- 1...Ra2
- 2.Scxb4#
- 1...Ra3
- 2.Scxb4#
- 1...Sa1
- 2.Rd4#
- 1...Sc1
- 2.Rd4#
- 1...Sd2
- 2.Rd4#
- 1...Sh5
- 2.Qe6#
- 1...Se6
- 2.Qxe6#
- 1...Se8
- 2.Qe6#
- 1...Ra1+!
- 1...h1Q+
- 1.Kg3?
- 1...h1S+
- 2.Qxh1#
- 1...Rxa5
- 2.Scxb4#
- 1...Sxa5
- 2.Rd4#
- 1...Sxc5
- 2.Sxc7#
- 2.Rd4#
- 1...dxc5
- 2.Sxc7#
- 1...Sd4
- 2.Rxd4#
- 1...h1Q
- 2.Qxh1#
- 1...h1B
- 2.Qxh1#
- 1...h1R
- 2.Qxh1#
- 1...Ra1
- 2.Scxb4#
- 1...Ra2
- 2.Scxb4#
- 1...Ra3
- 2.Scxb4#
- 1...Sa1
- 2.Rd4#
- 1...Sc1
- 2.Rd4#
- 1...Sd2
- 2.Rd4#
- 1...Se6
- 2.Qxe6#
- 1...Se8
- 2.Qe6#
- 1...Sh5+!
- 1...h1S+
- 1.Re1?
- 1...h1S+
- 2.Qxh1#
- 1...Rxa5
- 2.Scxb4#
- 1...Sxa5
- 2.Rd4#
- 1...Sxc5
- 2.Sxc7#
- 2.Rd4#
- 1...dxc5
- 2.Sxc7#
- 1...Sd4
- 2.Rxd4#
- 1...h1Q
- 2.Qxh1#
- 1...h1B
- 2.Qxh1#
- 1...h1R
- 2.Qxh1#
- 1...Ra1
- 2.Scxb4#
- 1...Ra3
- 2.Scxb4#
- 1...Sa1
- 2.Rd4#
- 1...Sc1
- 2.Rd4#
- 1...Sd2
- 2.Rd4#
- 1...Sh5
- 2.Qe6#
- 1...Se6
- 2.Qxe6#
- 1...Se8
- 2.Qe6#
- 1...Ra2!
- 1...h1S+
- 1.Re3?
- 1...h1S+
- 2.Qxh1#
- 1...Rxa5
- 2.Scxb4#
- 1...Sxa5
- 2.Rd4#
- 1...Sxc5
- 2.Sxc7#
- 2.Rd4#
- 1...dxc5
- 2.Sxc7#
- 1...Sd4
- 2.Rxd4#
- 1...h1Q
- 2.Qxh1#
- 1...h1B
- 2.Qxh1#
- 1...h1R
- 2.Qxh1#
- 1...Ra1
- 2.Scxb4#
- 1...Ra3
- 2.Scxb4#
- 1...Sa1
- 2.Rd4#
- 1...Sc1
- 2.Rd4#
- 1...Sd2
- 2.Rd4#
- 1...Sh5
- 2.Qe6#
- 1...Se6
- 2.Qxe6#
- 1...Se8
- 2.Qe6#
- 1...Ra2!
- 1...h1S+
- 1.Re5+?
- 1...dxe5
- 2.Se3#
- 1...Kxe5!
- 1...dxe5
- 1.Re7?
- threat
- 2.Se3#
- 1...h1S+
- 2.Qxh1#
- 1...Se6
- 2.Qxe6#
- 1...Ra2!
- threat
- 1.Rxf5+?
- 1...Sxf5
- 2.Qe6#
- 1...Kc4!
- 1...Sxf5
- 1.Qxg7?
- threat
- 2.Qf7#
- 2.Qg8#
- 1...Sxc5
- 2.Sxc7#
- 2.Rd4#
- 2.Qd4#
- 1...dxc5
- 2.Qe5#
- 2.Qd7#
- 1...Sd4
- 2.Rxd4#
- 2.Qxd4#
- 1...h1S+!
- threat
- 1.Qxh2?
- threat
- 2.Qh1#
- 2.Qg2#
- 1...Sxc5
- 2.Sxc7#
- 2.Rd4#
- 1...Sd4
- 2.Rxd4#
- 1...Ra1
- 2.Scxb4#
- 2.Qg2#
- 1...Sd2
- 2.Rd4#
- 1...dxc5!
- threat
- 1.Qh3?
- threat
- 2.Qg2#
- 2.Qxb3#
- 2.Qf3#
- 1...h1S+
- 2.Qxh1#
- 1...Sxa5
- 2.Rd4#
- 2.Qg2#
- 2.Qd3#
- 2.Qf3#
- 1...Sxc5
- 2.Sxc7#
- 2.Rd4#
- 1...Sd4
- 2.Rxd4#
- 1...h1Q
- 2.Qxh1#
- 2.Qxb3#
- 1...h1B
- 2.Qxh1#
- 2.Qxb3#
- 1...Ra3
- 2.Scxb4#
- 2.Qg2#
- 2.Qf3#
- 1...Sa1
- 2.Rd4#
- 2.Qg2#
- 2.Qd3#
- 2.Qf3#
- 1...Sc1
- 2.Rd4#
- 2.Qg2#
- 2.Qf3#
- 1...Sd2
- 2.Rd4#
- 2.Qd3#
- 1...dxc5!
- threat
- 1.Qh4?
- 1...h1S+
- 2.Qxh1#
- 1...Rxa5
- 2.Scxb4#
- 1...Sxa5
- 2.Rd4#
- 1...Sxc5
- 2.Sxc7#
- 2.Rd4#
- 1...Sd4
- 2.Rxd4#
- 1...h1Q
- 2.Qxh1#
- 1...h1B
- 2.Qxh1#
- 1...h1R
- 2.Qxh1#
- 1...Ra2
- 2.Scxb4#
- 1...Ra1
- 2.Scxb4#
- 1...Ra3
- 2.Scxb4#
- 1...Sa1
- 2.Rd4#
- 1...Sc1
- 2.Rd4#
- 1...Sd2
- 2.Rd4#
- 1...Sh5
- 2.Rxf5#
- 1...Se6
- 2.Rxf5#
- 1...Se8
- 2.Rxf5#
- 1...dxc5!
- 1...h1S+
- 1.Qh7?
- 1...h1S+
- 2.Qxh1#
- 1...Rxa5
- 2.Scxb4#
- 1...Sxa5
- 2.Rd4#
- 1...Sxc5
- 2.Sxc7#
- 2.Rd4#
- 1...Sd4
- 2.Rxd4#
- 1...h1Q
- 2.Qxh1#
- 1...h1B
- 2.Qxh1#
- 1...h1R
- 2.Qxh1#
- 1...Ra2
- 2.Scxb4#
- 1...Ra1
- 2.Scxb4#
- 1...Ra3
- 2.Scxb4#
- 1...Sa1
- 2.Rd4#
- 1...Sc1
- 2.Rd4#
- 1...Sd2
- 2.Rd4#
- 1...Sh5
- 2.Qxf5#
- 2.Qg8#
- 2.Qf7#
- 1...Se6
- 2.Qxf5#
- 1...Se8
- 2.Qxf5#
- 2.Qg8#
- 2.Qf7#
- 1...dxc5!
- 1...h1S+
- 1.Ke1?
- Keys
- 1.Qh8!
- 1...h1S+
- 2.Qxh1#
- 1...Rxa5
- 2.Scxb4#
- 1...Sxa5
- 2.Rd4#
- 1...Sxc5
- 2.Sxc7#
- 2.Rd4#
- 1...dxc5
- 2.Qd8#
- 1...Sd4
- 2.Rxd4#
- 1...h1Q
- 2.Qxh1#
- 1...h1B
- 2.Qxh1#
- 1...h1R
- 2.Qxh1#
- 1...Ra2
- 2.Scxb4#
- 1...Ra1
- 2.Scxb4#
- 1...Ra3
- 2.Scxb4#
- 1...Sa1
- 2.Rd4#
- 1...Sc1
- 2.Rd4#
- 1...Sd2
- 2.Rd4#
- 1...Sh5
- 2.Qg8#
- 1...Se6
- 2.Se3#
- 1...Se8
- 2.Qg8#
- 1...h1S+
- 1.Qh8!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 4
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- R(c);N_GUARD::S(A),XP(d)
- R(c);N_GUARD,XP(E)::S(A),XP(d)
- S(b);N_GUARD::R1(D)
- S(b);N_GUARD::R1(D),XS(b)
- S(b);N_GUARD,XP(E)::R1(D)
- S(j);N_GUARD::QAB1(I)
- S(j);N_GUARD::QAB1(I),XS(j)
- P(a);OGATE::QAB(I),XQ(a)
- P(a);CHECK,OGATE::QAB(I),XS(a)
- P(a);OGATE::QAB(I),XB(a)
- P(a);OGATE::QAB(I),XR(a)
- P(h);SBLOCK,XP(F)::S(H),XP(i)
- Tries
- Try
- K(C);S_FLIGHT
- Vars
- P(a);CHECK,OGATE::QAB(I),XQ(a)
- P(a);CHECK,OGATE::QAB(I),XR(a)
- R(c);N_GUARD,XP(E)::S(A),XP(d)
- S(b);N_GUARD,XP(E)::R1(D)
- P(h);SBLOCK,XP(F)::S(H),XP(i)
- S(b);N_GUARD::R1(D),XS(b)
- P(a);OGATE::QAB(I),XS(a)
- P(a);OGATE::QAB(I),XB(a)
- R(c);N_GUARD::S(A),XP(d)
- S(b);N_GUARD::R1(D)
- S(j);N_GUARD::QAB1(I)
- S(j);N_GUARD::QAB1(I),XS(j)
- Refutation
- R(c);CHECK
- Try
- K(C);S_FLIGHT
- Vars
- P(a);CHECK,OGATE::QAB(I),XS(a)
- R(c);N_GUARD,XP(E)::S(A),XP(d)
- S(b);N_GUARD,XP(E)::R1(D)
- P(h);SBLOCK,XP(F)::S(H),XP(i)
- S(b);N_GUARD::R1(D),XS(b)
- P(a);OGATE::QAB(I),XQ(a)
- P(a);OGATE::QAB(I),XB(a)
- P(a);OGATE::QAB(I),XR(a)
- R(c);N_GUARD::S(A),XP(d)
- S(b);N_GUARD::R1(D)
- S(j);N_GUARD::QAB1(I),XS(j)
- S(j);N_GUARD::QAB1(I)
- Refutation
- S(j);CHECK
- Try
- R(B);
- Vars
- P(a);CHECK,OGATE::QAB(I),XS(a)
- R(c);N_GUARD,XP(E)::S(A),XP(d)
- S(b);N_GUARD,XP(E)::R1(D)
- P(h);SBLOCK,XP(F)::S(H),XP(i)
- S(b);N_GUARD::R1(D),XS(b)
- P(a);OGATE::QAB(I),XQ(a)
- P(a);OGATE::QAB(I),XB(a)
- P(a);OGATE::QAB(I),XR(a)
- R(c);N_GUARD::S(A),XP(d)
- S(b);N_GUARD::R1(D)
- S(j);N_GUARD::QAB1(I)
- S(j);N_GUARD::QAB1(I),XS(j)
- Refutation
- R(c);P_PINS(A)
- Try
- R(B);
- Vars
- P(a);CHECK,OGATE::QAB(I),XS(a)
- R(c);N_GUARD,XP(E)::S(A),XP(d)
- S(b);N_GUARD,XP(E)::R1(D)
- P(h);SBLOCK,XP(F)::S(H),XP(i)
- S(b);N_GUARD::R1(D),XS(b)
- P(a);OGATE::QAB(I),XQ(a)
- P(a);OGATE::QAB(I),XB(a)
- P(a);OGATE::QAB(I),XR(a)
- R(c);N_GUARD::S(A),XP(d)
- S(b);N_GUARD::R1(D)
- S(j);N_GUARD::QAB1(I)
- S(j);N_GUARD::QAB1(I),XS(j)
- Refutation
- R(c);P_PINS(A)
- Try
- R(B);CHECK
- Vars
- P(h);SBLOCK,XR(B)::S(A)
- Refutation
- K(e);P-FLIGHT,XR(B)
- Try
- R(B);
- Threat
- S(A)
- Vars
- P(a);CHECK,OGATE::QAB(I),XS(a)
- S(j);N_GUARD::QAB1(I),XS(j)
- Refutation
- R(c);P_PINS(A)
- Try
- R(D);CHECK,XP(f)
- Vars
- S(j);XR(D)::QAB1(I)
- Refutation
- K(e);S_FLIGHT
- Try
- Q(I);XS(j)
- Threat
- DUALS(2)
- Refutation
- P(a);CHECK
- Try
- Q(I);XP(a)
- Threat
- DUALS(2)
- Vars
- S(b);N_GUARD::R1(D),XS(b)
- S(b);N_GUARD::R1(D)
- Refutation
- P(h);XP(F)
- Try
- Q(I);
- Threat
- DUALS(3)
- Vars
- P(a);CHECK,OGATE::QAB(I),XS(a)
- S(b);N_GUARD::R1(D),XS(b)
- Refutation
- P(h);XP(F)
- Try
- Q(I);
- Vars
- P(a);CHECK,OGATE::QAB(I),XS(a)
- R(c);N_GUARD,XP(E)::S(A),XP(d)
- S(b);N_GUARD,XP(E)::R1(D)
- S(b);N_GUARD::R1(D),XS(b)
- P(a);OGATE::QAB(I),XQ(a)
- P(a);OGATE::QAB(I),XB(a)
- P(a);OGATE::QAB(I),XR(a)
- R(c);N_GUARD::S(A),XP(d)
- S(b);N_GUARD::R1(D)
- S(j);N_GUARD::R(D),XP(f)
- Refutation
- P(h);XP(F)
- Try
- Q(I);
- Vars
- P(a);CHECK,OGATE::QAB(I),XS(a)
- R(c);N_GUARD,XP(E)::S(A),XP(d)
- S(b);N_GUARD,XP(E)::R1(D)
- S(b);N_GUARD::R1(D),XS(b)
- P(a);OGATE::QAB(I),XQ(a)
- P(a);OGATE::QAB(I),XB(a)
- P(a);OGATE::QAB(I),XR(a)
- R(c);N_GUARD::S(A),XP(d)
- S(b);N_GUARD::R1(D)
- S(j);N_GUARD::QAR2(I),XP(f)
- Refutation
- P(h);XP(F)
- Try
- Actual
- Q(I);
- Vars
- P(a);CHECK,OGATE::QAB(I),XS(a)
- R(c);N_GUARD,XP(E)::S(A),XP(d)
- S(b);N_GUARD,XP(E)::R1(D)
- P(h);OGATEB,XP(F)::QAR(I)
- S(b);N_GUARD::R1(D),XS(b)
- P(a);OGATE::QAB(I),XQ(a)
- P(a);OGATE::QAB(I),XB(a)
- P(a);OGATE::QAB(I),XR(a)
- R(c);N_GUARD::S(A),XP(d)
- S(b);N_GUARD::R1(D)
- S(j);N_GUARD::QAB(I)
- S(j);SBLOCK::S(A)
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).