MESON Chess Problem Database
Problem Display
PID: 71130 (Q7/8/2N1P1n1/2pP3R/R1Brkp2/br1N3K/4P3/q4nB1 w - - 0 1)
Isaev, Leonid Antonovich
Levman, Semyon Semyonovich
3rd Prize, Zadachi i Etyudi, 1929
#2
11 + 9
SOLUTION
- SOUND
- Sets
- 1...Rbxd3+
- 2.Bxd3#
- 1...Rb4
- 2.Sxc5#
- 1...Rdxd3+
- 2.Bxd3#
- 1...Rxd5
- 2.Bxd5#
- 1...Se3
- 2.Sf2#
- 1...Sh4
- 2.Re5#
- 1...Se5
- 2.Rxe5#
- 1...Se7
- 2.Re5#
- 1...Sf8
- 2.Re5#
- 1...Sh8
- 2.Re5#
- 1...Rbxd3+
- Tries
- 1.Qe8?
- threat
- 2.Qxg6#
- 1...Rbxd3+
- 2.Bxd3#
- 1...Rdxd3+
- 2.Bxd3#
- 1...Rxd5
- 2.Bxd5#
- 1...Se3
- 2.Sf2#
- 1...Sh4
- 2.Re5#
- 1...Se5
- 2.Rxe5#
- 1...Se7
- 2.Re5#
- 1...Sf8
- 2.Re5#
- 1...Sh8
- 2.Re5#
- 1...Sg3!
- threat
- 1.Qf8?
- threat
- 2.Qf5#
- 1...Rbxd3+
- 2.Bxd3#
- 1...Rdxd3+
- 2.Bxd3#
- 1...Rxd5
- 2.Bxd5#
- 1...Sxf8
- 2.Re5#
- 1...Se3
- 2.Sf2#
- 1...Sh4
- 2.Re5#
- 2.Qxf4#
- 1...Se7
- 2.Re5#
- 2.Qxf4#
- 1...Sg3!
- threat
- 1.Qg8?
- threat
- 2.Qxg6#
- 1...Rbxd3+
- 2.Bxd3#
- 1...Rdxd3+
- 2.Bxd3#
- 1...Rxd5
- 2.Bxd5#
- 1...Se3
- 2.Sf2#
- 1...Sh4
- 2.Re5#
- 1...Se5
- 2.Rxe5#
- 1...Se7
- 2.Re5#
- 1...Sf8
- 2.Re5#
- 1...Sh8
- 2.Re5#
- 1...Sg3!
- threat
- 1.Qe8?
- Keys
- 1.d6!
- threat
- 2.Bd5#
- 1...Rbxd3+
- 2.Bxd3#
- 1...Rdxd3+
- 2.Bxd3#
- 1...Rxc4
- 2.Sb4#
- 1...Rb4
- 2.Sxc5#
- 1...Rd5
- 2.Bxd5#
- 1...Bb4
- 2.Sxd4#
- 1...Se3
- 2.Sf2#
- 1...Se5
- 2.Rxe5#
- 1...Se7
- 2.Re5#
- threat
- 1.d6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 3
- Sets
- R(d);CHECK,OGATE,XS(C)::B(F),XR(d)
- R(d);N_PINS(C)::S(C),XP(h)
- R(e);CHECK,OGATE,XS(C)::R(E)+B(F),DCHECK,XR(e)
- R(e);OGATE,XP(G)::R(E)+B(F),DCHECK,XR(e)
- S(b);N_PINS(C),SBLOCK::S(C)
- S(i);N_GUARD::R1(H)
- S(i);N_GUARD::R1(H),XS(i)
- Tries
- Try
- Q(K);
- Threat
- QAB(K),XS(i)
- Vars
- R(d);CHECK,OGATE,XS(C)::B(F),XR(d)
- R(e);CHECK,OGATE,XS(C)::R(E)+B(F),DCHECK,XR(e)
- R(e);OGATE,XP(G)::R(E)+B(F),DCHECK,XR(e)
- S(b);N_PINS(C),SBLOCK::S(C)
- S(i);N_GUARD::R1(H)
- S(i);N_GUARD::R1(H),XS(i)
- Refutation
- S(b);N_PINS(C)
- Try
- Q(K);
- Threat
- QAB1(K)
- Vars
- R(d);CHECK,OGATE,XS(C)::B(F),XR(d)
- R(e);CHECK,OGATE,XS(C)::R(E)+B(F),DCHECK,XR(e)
- R(e);OGATE,XP(G)::R(E)+B(F),DCHECK,XR(e)
- S(i);N_GUARD,XQ(K)::R1(H)
- S(b);N_PINS(C),SBLOCK::S(C)
- Refutation
- S(b);N_PINS(C)
- Try
- Q(K);
- Threat
- QAB(K),XS(i)
- Vars
- R(d);CHECK,OGATE,XS(C)::B(F),XR(d)
- R(e);CHECK,OGATE,XS(C)::R(E)+B(F),DCHECK,XR(e)
- R(e);OGATE,XP(G)::R(E)+B(F),DCHECK,XR(e)
- S(b);N_PINS(C),SBLOCK::S(C)
- S(i);N_GUARD::R1(H)
- S(i);N_GUARD::R1(H),XS(i)
- Refutation
- S(b);N_PINS(C)
- Try
- Actual
- P(G);
- Threat
- B(F)
- Vars
- R(d);CHECK,OGATE,XS(C)::B(F),XR(d)
- R(e);CHECK,OGATE,XS(C)::R(E)+B(F),DCHECK,XR(e)
- R(e);N_GUARD,P_SPINR(e),XB(F)::QAB(K)+S(I)
- R(d);N_PINS(C)::S(C),XP(h)
- R(e);::R(E)+B(F),DCHECK,XR(e)
- B(c);S_CUTR(d)::QAB(K)+S(I),XR(e)
- S(b);N_PINS(C),SBLOCK::S(C)
- S(i);N_GUARD::R1(H),XS(i)
- S(i);N_GUARD::R1(H)
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).