MESON Chess Problem Database
Problem Display
PID: 198271 (2Q4K/5p2/1N2pn2/4R3/1B1p4/rp1knB2/1R6/3r1b2 w - - 0 1)
O'Keefe, John James
Rivista del Club Argentino de Ajedrez, 1920
#2
7 + 10
| 6490 | yacpdb | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Rda1
- 2.Rd2#
- 1...Rb1
- 2.Rd2#
- 1...Rc1
- 2.Rd2#
- 1...Re1
- 2.Rd2#
- 1...Rd2
- 2.Rxd2#
- 1...Raa1
- 2.Rxb3#
- 1...Ra2
- 2.Rxb3#
- 1...Ra4
- 2.Rxb3#
- 1...Ra5
- 2.Rxb3#
- 1...Ra6
- 2.Rxb3#
- 1...Ra7
- 2.Rxb3#
- 1...Ra8
- 2.Rxb3#
- 1...Be2
- 2.Bxe2#
- 1...Bg2
- 2.Be2#
- 1...Bh3
- 2.Be2#
- 1...Sc2
- 2.Qc4#
- 1...Sg2
- 2.Qc4#
- 1...Sc4
- 2.Qxc4#
- 1...Seg4
- 2.Qc4#
- 1...Sed5
- 2.Qc4#
- 1...Sf5
- 2.Qc4#
- 1...Se4
- 2.Bxe4#
- 1...Sfg4
- 2.Be4#
- 1...Sfd5
- 2.Be4#
- 1...Sh5
- 2.Be4#
- 1...Sd7
- 2.Be4#
- 1...Sh7
- 2.Be4#
- 1...Se8
- 2.Be4#
- 1...Sg8
- 2.Be4#
- 1...Rda1
- Tries
- 1.Bxd1?
- threat
- 2.Rd2#
- 1...Sc2
- 2.Qc4#
- 1...Ra2
- 2.Rxb3#
- 1...Sc4
- 2.Qxc4#
- 1...Se4!
- threat
- 1.Be1?
- 1...Raa1
- 2.Rxb3#
- 1...Rda1
- 2.Rd2#
- 1...Rb1
- 2.Rd2#
- 1...Rc1
- 2.Rd2#
- 1...Rd2
- 2.Rxd2#
- 1...Ra2
- 2.Rxb3#
- 1...Ra4
- 2.Rxb3#
- 1...Ra5
- 2.Rxb3#
- 1...Ra6
- 2.Rxb3#
- 1...Ra7
- 2.Rxb3#
- 1...Ra8
- 2.Rxb3#
- 1...Be2
- 2.Bxe2#
- 1...Bg2
- 2.Be2#
- 1...Bh3
- 2.Be2#
- 1...Sc2
- 2.Qc4#
- 1...Sg2
- 2.Qc4#
- 1...Sc4
- 2.Qxc4#
- 1...Seg4
- 2.Qc4#
- 1...Sed5
- 2.Qc4#
- 1...Sf5
- 2.Qc4#
- 1...Se4
- 2.Bxe4#
- 1...Sfg4
- 2.Be4#
- 1...Sfd5
- 2.Be4#
- 1...Sh5
- 2.Be4#
- 1...Sd7
- 2.Be4#
- 1...Sh7
- 2.Be4#
- 1...Se8
- 2.Be4#
- 1...Sg8
- 2.Be4#
- 1...Rxe1!
- 1...Raa1
- 1.Ba5?
- 1...Raa1
- 2.Rxb3#
- 1...Rda1
- 2.Rd2#
- 1...Rb1
- 2.Rd2#
- 1...Rc1
- 2.Rd2#
- 1...Re1
- 2.Rd2#
- 1...Rd2
- 2.Rxd2#
- 1...Ra2
- 2.Rxb3#
- 1...Ra4
- 2.Rxb3#
- 1...Be2
- 2.Bxe2#
- 1...Bg2
- 2.Be2#
- 1...Bh3
- 2.Be2#
- 1...Sc2
- 2.Qa6#
- 2.Qc4#
- 1...Sg2
- 2.Qa6#
- 2.Qc4#
- 1...Sc4
- 2.Qxc4#
- 1...Seg4
- 2.Qa6#
- 2.Qc4#
- 1...Sed5
- 2.Qa6#
- 2.Qc4#
- 1...Sf5
- 2.Qa6#
- 2.Qc4#
- 1...Se4
- 2.Bxe4#
- 1...Sfg4
- 2.Be4#
- 1...Sfd5
- 2.Be4#
- 1...Sh5
- 2.Be4#
- 1...Sd7
- 2.Be4#
- 1...Sh7
- 2.Be4#
- 1...Se8
- 2.Be4#
- 1...Sg8
- 2.Be4#
- 1...Rxa5!
- 1...Raa1
- 1.Rxe3+?
- 1...dxe3
- 2.Qc3#
- 2.Qc4#
- 1...Kxe3!
- 1...dxe3
- 1.Rxe6?
- 1...Raa1
- 2.Rxb3#
- 1...Rda1
- 2.Rd2#
- 1...Rb1
- 2.Rd2#
- 1...Rc1
- 2.Rd2#
- 1...Re1
- 2.Rd2#
- 1...Rd2
- 2.Rxd2#
- 1...Ra2
- 2.Rxb3#
- 1...Ra4
- 2.Rxb3#
- 1...Ra5
- 2.Rxb3#
- 1...Ra6
- 2.Rxb3#
- 1...Ra7
- 2.Rxb3#
- 1...Ra8
- 2.Rxb3#
- 1...Be2
- 2.Bxe2#
- 1...Bg2
- 2.Be2#
- 1...Bh3
- 2.Be2#
- 1...Sc2
- 2.Qc4#
- 1...Sg2
- 2.Qc4#
- 1...Sc4
- 2.Qxc4#
- 1...Seg4
- 2.Qc4#
- 1...Sed5
- 2.Qc4#
- 1...Sf5
- 2.Qc4#
- 1...Se4
- 2.Bxe4#
- 1...Sfg4
- 2.Be4#
- 1...Sfd5
- 2.Be4#
- 1...Sh5
- 2.Be4#
- 1...Sd7
- 2.Be4#
- 1...Sh7
- 2.Be4#
- 1...Se8
- 2.Be4#
- 1...Sg8
- 2.Be4#
- 1...fxe6!
- 1...Raa1
- 1.Qa6+?
- 1...Sc4
- 2.Qxc4#
- 1...Rxa6!
- 1...Sc4
- 1.Qc1?
- 1...Rxc1
- 2.Rd2#
- 1...Ra1
- 2.Rxb3#
- 1...Re1
- 2.Rd2#
- 2.Qd2#
- 1...Rd2
- 2.Rxd2#
- 2.Qxd2#
- 1...Ra2
- 2.Rxb3#
- 1...Ra4
- 2.Rxb3#
- 1...Ra5
- 2.Rxb3#
- 1...Ra6
- 2.Rxb3#
- 1...Ra7
- 2.Rxb3#
- 1...Be2
- 2.Bxe2#
- 1...Bg2
- 2.Be2#
- 1...Bh3
- 2.Be2#
- 1...Sc2
- 2.Qxd1#
- 1...Sg2
- 2.Qxd1#
- 2.Qc4#
- 1...Sc4
- 2.Qxc4#
- 1...Seg4
- 2.Qxd1#
- 2.Qc4#
- 1...Sed5
- 2.Qxd1#
- 2.Qc4#
- 1...Sf5
- 2.Qxd1#
- 2.Qc4#
- 1...Se4
- 2.Bxe4#
- 1...Sfg4
- 2.Be4#
- 1...Sfd5
- 2.Be4#
- 1...Sh5
- 2.Be4#
- 1...Sd7
- 2.Be4#
- 1...Sh7
- 2.Be4#
- 1...Se8
- 2.Be4#
- 1...Sg8
- 2.Be4#
- 1...Ra8+!
- 1...Rxc1
- 1.Qc5?
- 1...Raa1
- 2.Rxb3#
- 1...Rda1
- 2.Rd2#
- 1...Rb1
- 2.Rd2#
- 1...Rc1
- 2.Rd2#
- 1...Re1
- 2.Rd2#
- 1...Rd2
- 2.Rxd2#
- 1...Ra2
- 2.Rxb3#
- 1...Ra4
- 2.Rxb3#
- 1...Ra5
- 2.Rxb3#
- 1...Ra6
- 2.Rxb3#
- 1...Ra7
- 2.Rxb3#
- 1...Be2
- 2.Bxe2#
- 1...Bg2
- 2.Be2#
- 1...Bh3
- 2.Be2#
- 1...Sc2
- 2.Qc4#
- 2.Qb5#
- 1...Sg2
- 2.Qc4#
- 2.Qb5#
- 1...Sc4
- 2.Qxc4#
- 1...Seg4
- 2.Qc4#
- 2.Qb5#
- 1...Sed5
- 2.Qc4#
- 2.Qb5#
- 1...Sf5
- 2.Qc4#
- 2.Qb5#
- 1...Se4
- 2.Bxe4#
- 1...Sfg4
- 2.Be4#
- 1...Sfd5
- 2.Be4#
- 1...Sh5
- 2.Be4#
- 1...Sd7
- 2.Be4#
- 1...Sh7
- 2.Be4#
- 1...Se8
- 2.Be4#
- 1...Sg8
- 2.Be4#
- 1...Ra8+!
- 1...Raa1
- 1.Qc6?
- 1...Raa1
- 2.Rxb3#
- 1...Rda1
- 2.Rd2#
- 1...Rb1
- 2.Rd2#
- 1...Rc1
- 2.Rd2#
- 1...Re1
- 2.Rd2#
- 1...Rd2
- 2.Rxd2#
- 1...Ra2
- 2.Rxb3#
- 1...Ra4
- 2.Rxb3#
- 1...Ra5
- 2.Rxb3#
- 1...Ra6
- 2.Rxb3#
- 1...Ra7
- 2.Rxb3#
- 1...Be2
- 2.Bxe2#
- 1...Bg2
- 2.Be2#
- 1...Bh3
- 2.Be2#
- 1...Sc2
- 2.Qb5#
- 2.Qc4#
- 1...Sg2
- 2.Qb5#
- 2.Qc4#
- 1...Sc4
- 2.Qxc4#
- 1...Seg4
- 2.Qb5#
- 2.Qc4#
- 1...Sed5
- 2.Qb5#
- 2.Qc4#
- 1...Sf5
- 2.Qb5#
- 2.Qc4#
- 1...Se4
- 2.Bxe4#
- 2.Qxe4#
- 1...Sfg4
- 2.Be4#
- 2.Qe4#
- 1...Sfd5
- 2.Be4#
- 1...Sh5
- 2.Be4#
- 2.Qe4#
- 1...Sd7
- 2.Be4#
- 2.Qe4#
- 1...Sh7
- 2.Be4#
- 2.Qe4#
- 1...Se8
- 2.Be4#
- 2.Qe4#
- 1...Sg8
- 2.Be4#
- 2.Qe4#
- 1...Ra8+!
- 1...Raa1
- 1.Qc7?
- 1...Raa1
- 2.Rxb3#
- 1...Rda1
- 2.Rd2#
- 1...Rb1
- 2.Rd2#
- 1...Rc1
- 2.Rd2#
- 1...Re1
- 2.Rd2#
- 1...Rd2
- 2.Rxd2#
- 1...Ra2
- 2.Rxb3#
- 1...Ra4
- 2.Rxb3#
- 1...Ra5
- 2.Rxb3#
- 1...Ra6
- 2.Rxb3#
- 1...Ra7
- 2.Rxb3#
- 1...Be2
- 2.Bxe2#
- 1...Bg2
- 2.Be2#
- 1...Bh3
- 2.Be2#
- 1...Sc2
- 2.Qc4#
- 1...Sg2
- 2.Qc4#
- 1...Sc4
- 2.Qxc4#
- 1...Seg4
- 2.Qc4#
- 1...Sed5
- 2.Qc4#
- 1...Sf5
- 2.Qc4#
- 1...Se4
- 2.Bxe4#
- 1...Sfg4
- 2.Be4#
- 1...Sfd5
- 2.Be4#
- 1...Sh5
- 2.Be4#
- 1...Sd7
- 2.Be4#
- 1...Sh7
- 2.Be4#
- 1...Se8
- 2.Be4#
- 1...Sg8
- 2.Be4#
- 1...Ra8+!
- 1...Raa1
- 1.Bxd1?
- Keys
- 1.Sa4!
- 1...Rxa4
- 2.Rxb3#
- 1...Rda1
- 2.Rd2#
- 1...Rb1
- 2.Rd2#
- 1...Rc1
- 2.Rd2#
- 1...Re1
- 2.Rd2#
- 1...Rd2
- 2.Rxd2#
- 1...Raa1
- 2.Rxb3#
- 1...Ra2
- 2.Rxb3#
- 1...Be2
- 2.Bxe2#
- 1...Bg2
- 2.Be2#
- 1...Bh3
- 2.Be2#
- 1...Sc2
- 2.Qa6#
- 1...Sg2
- 2.Qa6#
- 1...Sc4
- 2.Sc5#
- 1...Seg4
- 2.Qa6#
- 1...Sed5
- 2.Qa6#
- 1...Sf5
- 2.Qa6#
- 1...Se4
- 2.Bxe4#
- 1...Sfg4
- 2.Be4#
- 1...Sfd5
- 2.Be4#
- 1...Sh5
- 2.Be4#
- 1...Sd7
- 2.Be4#
- 1...Sh7
- 2.Be4#
- 1...Se8
- 2.Be4#
- 1...Sg8
- 2.Be4#
- 1...Rxa4
- 1.Sa4!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 6
- ADDED MATES = 0
- REMOVED MATES = 4
- Sets
- R(a);N_GUARD::R1(A)
- R(a);N_GUARD::R1(A),XR(a)
- R(c);N_GUARD::R(A),XP(d)
- R(c);N_GUARD,P_PINQ(F)::R(A),XP(d)
- B(b);N_GUARD::B(B),XB(b)
- B(b);N_GUARD::B(B)
- S(f);N_GUARD::QAB1(F)
- S(f);N_GUARD::QAB1(F),XS(f)
- S(i);N_GUARD::B(B),XS(i)
- S(i);N_GUARD::B(B)
- Tries
- Try
- B(B);XR(a)
- Threat
- R1(A)
- Vars
- S(f);N_GUARD::QAB1(F)
- R(c);N_GUARD::R(A),XP(d)
- S(f);N_GUARD::QAB1(F),XS(f)
- Refutation
- S(i);
- Try
- B(C);
- Vars
- R(c);N_GUARD::R(A),XP(d)
- R(a);N_GUARD::R1(A)
- R(a);N_GUARD::R1(A),XR(a)
- R(c);N_GUARD,P_PINQ(F)::R(A),XP(d)
- B(b);N_GUARD::B(B),XB(b)
- B(b);N_GUARD::B(B)
- S(f);N_GUARD::QAB1(F)
- S(f);N_GUARD::QAB1(F),XS(f)
- S(i);N_GUARD::B(B),XS(i)
- S(i);N_GUARD::B(B)
- Refutation
- R(a);XB(C)
- Try
- B(C);
- Vars
- R(c);N_GUARD::R(A),XP(d)
- R(a);N_GUARD::R1(A)
- R(a);N_GUARD::R1(A),XR(a)
- B(b);N_GUARD::B(B),XB(b)
- B(b);N_GUARD::B(B)
- S(f);N_GUARD::QAB1(F),XS(f)
- S(i);N_GUARD::B(B),XS(i)
- S(i);N_GUARD::B(B)
- Refutation
- R(c);XB(C)
- Try
- R(D);CHECK,XS(f)
- Refutation
- K(e);P-FLIGHT,XR(D)
- Try
- R(D);XP(h)
- Vars
- R(c);N_GUARD::R(A),XP(d)
- R(a);N_GUARD::R1(A)
- R(a);N_GUARD::R1(A),XR(a)
- R(c);N_GUARD,P_PINQ(F)::R(A),XP(d)
- B(b);N_GUARD::B(B),XB(b)
- B(b);N_GUARD::B(B)
- S(f);N_GUARD::QAB1(F)
- S(f);N_GUARD::QAB1(F),XS(f)
- S(i);N_GUARD::B(B),XS(i)
- S(i);N_GUARD::B(B)
- Refutation
- P(j);XR(D)
- Try
- Q(F);CHECK
- Vars
- S(f);N_GUARD,P_SPINS(f)::QAB1(F),XS(f)
- Refutation
- R(c);XQ(F)
- Try
- Q(F);
- Vars
- R(a);N_GUARD,XQ(F)::R1(A)
- R(c);N_GUARD::R(A),XP(d)
- B(b);N_GUARD::B(B),XB(b)
- B(b);N_GUARD::B(B)
- S(f);N_GUARD::QAR2(F),XR(a)
- S(f);N_GUARD::QAB1(F),XS(f)
- S(i);N_GUARD::B(B),XS(i)
- S(i);N_GUARD::B(B)
- Refutation
- R(c);CHECK
- Try
- Q(F);
- Vars
- R(c);N_GUARD::R(A),XP(d)
- R(a);N_GUARD::R1(A)
- R(a);N_GUARD::R1(A),XR(a)
- B(b);N_GUARD::B(B),XB(b)
- B(b);N_GUARD::B(B)
- S(f);N_GUARD::QAB1(F),XS(f)
- S(i);N_GUARD::B(B),XS(i)
- S(i);N_GUARD::B(B)
- Refutation
- R(c);CHECK
- Try
- Q(F);
- Vars
- R(c);N_GUARD::R(A),XP(d)
- R(a);N_GUARD::R1(A)
- R(a);N_GUARD::R1(A),XR(a)
- B(b);N_GUARD::B(B),XB(b)
- B(b);N_GUARD::B(B)
- S(f);N_GUARD::QAB1(F),XS(f)
- S(i);N_GUARD::B(B)
- Refutation
- R(c);CHECK
- Try
- Q(F);
- Vars
- R(c);N_GUARD::R(A),XP(d)
- R(a);N_GUARD::R1(A)
- R(a);N_GUARD::R1(A),XR(a)
- B(b);N_GUARD::B(B),XB(b)
- B(b);N_GUARD::B(B)
- S(f);N_GUARD::QAB1(F)
- S(f);N_GUARD::QAB1(F),XS(f)
- S(i);N_GUARD::B(B),XS(i)
- S(i);N_GUARD::B(B)
- Refutation
- R(c);CHECK
- Try
- Actual
- S(E);
- Vars
- R(c);N_GUARD,XS(E)::R(A),XP(d)
- R(a);N_GUARD::R1(A)
- R(a);N_GUARD::R1(A),XR(a)
- R(c);N_GUARD::R(A),XP(d)
- B(b);N_GUARD::B(B),XB(b)
- B(b);N_GUARD::B(B)
- S(f);N_GUARD::QAB(F)
- S(f);SBLOCK::S(E)
- S(i);N_GUARD::B(B),XS(i)
- S(i);N_GUARD::B(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).