MESON Chess Problem Database
Problem Display
PID: 9730 (4R3/p5N1/K1Rp3B/8/1QPk2rn/p5b1/3p1Nnp/3r3b w - - 0 1)
Blake, Percy Francis
American Chess Bulletin, 1909
#2
8 + 12
SOLUTION
- SOUND
- Sets
- 1...Ra1
- 2.Qxd2#
- 1...Rb1
- 2.Qxd2#
- 1...Rc1
- 2.Qxd2#
- 1...Re1
- 2.Qxd2#
- 1...Rf1
- 2.Qxd2#
- 1...Rg1
- 2.Qxd2#
- 1...Re4
- 2.Rxe4#
- 1...Rf4
- 2.Rxd6#
- 1...Rg5
- 2.Re4#
- 1...Rg6
- 2.Re4#
- 1...Rxg7
- 2.Re4#
- 1...Bxf2
- 2.Rxd6#
- 1...Bf4
- 2.Re4#
- 1...Be5
- 2.Se6#
- 1...Se1
- 2.Be3#
- 1...Se3
- 2.Bxe3#
- 1...Sf3
- 2.Sf5#
- 1...Sf5
- 2.Sxf5#
- 1...Sg6
- 2.Sf5#
- 1...a2
- 2.Qb2#
- 1...d5
- 2.c5#
- 1...Ra1
- Tries
- 1.Sxd1?
- threat
- 2.Qxd2#
- 2.Qc3#
- 1...Kd3
- 2.Qxd2#
- 2.Qc3#
- 1...Sf4
- 2.Qc3#
- 1...Be1
- 2.Rxd6#
- 2.Qc3#
- 2.Qxd6#
- 1...Bf4
- 2.Qc3#
- 1...Se1
- 2.Qc3#
- 1...Sf3
- 2.Qc3#
- 1...Be5!
- threat
- 1.Bxd2?
- threat
- 2.Bc3#
- 2.Qc3#
- 1...Rxd2
- 2.Qxd2#
- 1...Bxf2
- 2.Rxd6#
- 2.Qc3#
- 2.Qxd6#
- 1...Re4
- 2.Rxe4#
- 2.Qc3#
- 1...Be5
- 2.Se6#
- 2.Qc3#
- 1...Rc1!
- threat
- 1.Bf4?
- threat
- 2.Se6#
- 2.Rxd6#
- 2.Re4#
- 1...Rxf4
- 2.Rxd6#
- 1...Rxg7
- 2.Rxd6#
- 2.Re4#
- 1...Bxf2
- 2.Rxd6#
- 1...Bxf4
- 2.Re4#
- 1...Re1
- 2.Rxd6#
- 2.Qxd2#
- 1...Rg5
- 2.Se6#
- 2.Re4#
- 1...Rg6
- 2.Re4#
- 1...Se1
- 2.Se6#
- 2.Be3#
- 1...Se3
- 2.Se6#
- 2.Bxe3#
- 1...Sf5
- 2.Sxf5#
- 2.Se6#
- 2.Re4#
- 1...d5
- 2.Se6#
- 2.c5#
- 1...Sxf4!
- threat
- 1.Re3?
- threat
- 2.Se6#
- 2.Qc3#
- 1...Rxg7
- 2.Re4#
- 2.Qc3#
- 1...Re4
- 2.Rxe4#
- 2.Qc3#
- 1...Rf4
- 2.Qc3#
- 1...Rg5
- 2.Re4#
- 2.Qc3#
- 1...Bf4
- 2.Re4#
- 2.Qc3#
- 1...Sf4
- 2.Qc3#
- 1...Rc1
- 2.Se6#
- 2.Qxd2#
- 1...Rg6
- 2.Re4#
- 2.Qc3#
- 1...Sxe3!
- threat
- 1.Re7?
- 1...Rxg7
- 2.Re4#
- 1...Bxf2
- 2.Rxd6#
- 1...Ra1
- 2.Qxd2#
- 1...Rb1
- 2.Qxd2#
- 1...Rc1
- 2.Qxd2#
- 1...Re1
- 2.Qxd2#
- 1...Rf1
- 2.Qxd2#
- 1...Rg1
- 2.Qxd2#
- 1...Re4
- 2.Rxe4#
- 1...Rf4
- 2.Rxd6#
- 1...Rg5
- 2.Re4#
- 1...Rg6
- 2.Re4#
- 1...Bf4
- 2.Re4#
- 1...Be5
- 2.Se6#
- 1...Se1
- 2.Be3#
- 1...Se3
- 2.Bxe3#
- 1...Sf3
- 2.Sf5#
- 1...Sf5
- 2.Sxf5#
- 1...Sg6
- 2.Sf5#
- 1...a2
- 2.Qb2#
- 1...d5
- 2.c5#
- 1...Sf4!
- 1...Rxg7
- 1.Qxa3?
- threat
- 2.Qb2#
- 2.Qd3#
- 1...Sf4
- 2.Qb2#
- 2.Qe3#
- 1...Ra1
- 2.Qxa1#
- 1...Rb1
- 2.Qd3#
- 1...Rc1
- 2.Qd3#
- 1...Se1
- 2.Be3#
- 2.Qb2#
- 2.Qe3#
- 1...Bxf2!
- threat
- 1.Qb3?
- threat
- 2.Qd3#
- 1...Sf4
- 2.Qe3#
- 1...Se1
- 2.Be3#
- 2.Qe3#
- 1...Bxf2!
- threat
- 1.Sxd1?
- Keys
- 1.Bg5!
- 1...Rxg5
- 2.Re4#
- 1...Bxf2
- 2.Rxd6#
- 1...Sf4
- 2.Bf6#
- 1...Ra1
- 2.Qxd2#
- 1...Rb1
- 2.Qxd2#
- 1...Rc1
- 2.Qxd2#
- 1...Re1
- 2.Qxd2#
- 1...Rf1
- 2.Qxd2#
- 1...Rg1
- 2.Qxd2#
- 1...Re4
- 2.Rxe4#
- 1...Rf4
- 2.Rxd6#
- 1...Bf4
- 2.Re4#
- 1...Be5
- 2.Se6#
- 1...Se1
- 2.Be3#
- 1...Se3
- 2.Bxe3#
- 1...Sf3
- 2.Sf5#
- 1...Sf5
- 2.Sxf5#
- 1...Sg6
- 2.Sf5#
- 1...a2
- 2.Qb2#
- 1...d5
- 2.c5#
- 1...Rxg5
- 1.Bg5!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 2
- Sets
- R(a);N_GUARD::QAR2(B),XP(c)
- R(i);N_GUARD::R1(H),XR(i)
- R(i);S_CUTB(g)::R(E),XP(k)
- R(i);N_GUARD::R1(H)
- R(i);N_GUARD,XS(G)::R1(H)
- B(g);N_GUARD,XS(A)::R(E),XP(k)
- B(g);S_CUTR(i)::R1(H)
- B(g);SBLOCK::S(G)
- S(d);N_GUARD::B(F)
- S(d);N_GUARD::B(F),XS(d)
- S(j);N_GUARD::S(G)
- S(j);N_GUARD::S(G),XS(j)
- P(f);N_GUARD::QAB(B)
- P(k);SBLOCK::QAR(B)+P(C)
- Tries
- Try
- S(A);XR(a)
- Threat
- DUALS(2)
- Vars
- S(d);::QAB1(B)
- B(g);::QAB1(B)
- S(j);::QAB1(B)
- Refutation
- B(g);
- Try
- B(F);XP(c)
- Threat
- DUALS(2)
- Vars
- R(a);OGATE,XB(F)::QAR2(B),XR(a)
- Refutation
- R(a);
- Try
- B(F);
- Threat
- DUALS(3)
- Vars
- R(i);XB(F)::R(E),XP(k)
- B(g);XS(A)::R(E),XP(k)
- B(g);XB(F)::R1(H)
- R(i);::R1(H)
- Refutation
- S(d);XB(F)
- Try
- R(H);
- Threat
- DUALS(2)
- Vars
- R(i);::QAB1(B)
- S(d);::QAB1(B)
- Refutation
- S(d);XR(H)
- Try
- R(H);
- Vars
- R(i);N_GUARD,XS(G)::R1(H)
- B(g);N_GUARD,XS(A)::R(E),XP(k)
- R(a);N_GUARD::QAR2(B),XP(c)
- R(i);N_GUARD::R1(H),XR(i)
- R(i);S_CUTB(g)::R(E),XP(k)
- R(i);N_GUARD::R1(H)
- B(g);S_CUTR(i)::R1(H)
- B(g);SBLOCK::S(G)
- S(d);N_GUARD::B(F)
- S(d);N_GUARD::B(F),XS(d)
- S(j);N_GUARD::S(G)
- S(j);N_GUARD::S(G),XS(j)
- P(f);N_GUARD::QAB(B)
- P(k);SBLOCK::QAR(B)+P(C)
- Refutation
- S(d);
- Try
- Q(B);XP(f)
- Threat
- DUALS(2)
- Vars
- R(a);N_GUARD,P_PINQ(B)::QAB(B),XR(a)
- R(a);::QAR1(B)
- Refutation
- B(g);XS(A)
- Try
- Q(B);
- Threat
- QAR1(B)
- Vars
- S(d);N_GUARD::QAB1(B)
- Refutation
- B(g);XS(A)
- Try
- Actual
- B(F);
- Vars
- R(i);N_GUARD,XB(F)::R1(H)
- B(g);N_GUARD,XS(A)::R(E),XP(k)
- S(d);S_CUTB(g)::B(F)
- R(a);N_GUARD::QAR2(B),XP(c)
- R(i);N_GUARD::R1(H),XR(i)
- R(i);S_CUTB(g)::R(E),XP(k)
- B(g);S_CUTR(i)::R1(H)
- B(g);SBLOCK::S(G)
- S(d);N_GUARD::B(F)
- S(d);N_GUARD::B(F),XS(d)
- S(j);N_GUARD::S(G)
- S(j);N_GUARD::S(G),XS(j)
- P(f);N_GUARD::QAB(B)
- P(k);SBLOCK::QAR(B)+P(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).