MESON Chess Problem Database
Problem Display
PID: 227563 (8/5p1B/5Ppn/2p1p3/2Rppk1N/2R4P/4p1Q1/2NbK2n w - - 0 1)
Isaev, Leonid Antonovich
3rd Prize, BCPS, 1926
#2
9 + 11
| 6490 | yacpdb | 2020 |
SOLUTION
- SOUND
- Sets
- 1...Bc2
- 2.Sxe2#
- 1...Bb3
- 2.Sxe2#
- 1...Ba4
- 2.Sxe2#
- 1...Sf2
- 2.Qg3#
- 1...Sg3
- 2.Qxg3#
- 1...Sg4
- 2.Qxg4#
- 1...Sf5
- 2.Qg4#
- 1...Sg8
- 2.Qg4#
- 1...dxc3
- 2.Rxe4#
- 1...d3
- 2.Rxe4#
- 1...e3
- 2.Sd3#
- 1...g5
- 2.Qxe4#
- 1...Bc2
- Tries
- 1.Sd3+?
- 1...Ke3
- 2.Qg5#
- 1...exd3!
- 1...Ke3
- 1.Bxg6?
- 1...dxc3
- 2.Rxe4#
- 1...Sg3
- 2.Qxg3#
- 1...Sg4
- 2.Qxg4#
- 1...d3
- 2.Rxe4#
- 1...Bc2
- 2.Sxe2#
- 1...Bb3
- 2.Sxe2#
- 1...Ba4
- 2.Sxe2#
- 1...Sf2
- 2.Qg3#
- 1...Sf5
- 2.Qg4#
- 1...Sg8
- 2.Qg4#
- 1...e3
- 2.Sd3#
- 1...fxg6!
- 1...dxc3
- 1.Bg8?
- 1...Sxg8
- 2.Qg4#
- 1...dxc3
- 2.Rxe4#
- 1...Sg3
- 2.Qxg3#
- 1...Sg4
- 2.Qxg4#
- 1...d3
- 2.Rxe4#
- 1...Bc2
- 2.Sxe2#
- 1...Bb3
- 2.Sxe2#
- 1...Ba4
- 2.Sxe2#
- 1...Sf2
- 2.Qg3#
- 1...Sf5
- 2.Qg4#
- 1...e3
- 2.Sd3#
- 1...g5!
- 1...Sxg8
- 1.Ra3?
- 1...Sg3
- 2.Qxg3#
- 1...Sg4
- 2.Qxg4#
- 1...d3
- 2.Rxe4#
- 1...Bc2
- 2.Sxe2#
- 1...Ba4
- 2.Sxe2#
- 1...Sf2
- 2.Qg3#
- 1...Sf5
- 2.Qg4#
- 1...Sg8
- 2.Qg4#
- 1...e3
- 2.Sd3#
- 1...g5
- 2.Qxe4#
- 1...Bb3!
- 1...Sg3
- 1.Rb3?
- 1...Sg3
- 2.Qxg3#
- 1...Sg4
- 2.Qxg4#
- 1...d3
- 2.Rxe4#
- 1...Bc2
- 2.Sxe2#
- 1...Sf2
- 2.Qg3#
- 1...Sf5
- 2.Qg4#
- 1...Sg8
- 2.Qg4#
- 1...e3
- 2.Sd3#
- 1...g5
- 2.Qxe4#
- 1...Bxb3!
- 1...Sg3
- 1.Ra4?
- 1...Bxa4
- 2.Sxe2#
- 1...dxc3
- 2.Rxe4#
- 1...Sg3
- 2.Qxg3#
- 1...Sg4
- 2.Qxg4#
- 1...d3
- 2.Rxe4#
- 1...Bc2
- 2.Sxe2#
- 1...Bb3
- 2.Sxe2#
- 1...Sf2
- 2.Qg3#
- 1...Sf5
- 2.Qg4#
- 1...Sg8
- 2.Qg4#
- 1...e3
- 2.Sd3#
- 1...g5
- 2.Qxe4#
- 1...c4!
- 1...Bxa4
- 1.Qh2+?
- 1...Sg3
- 2.Qxg3#
- 1...Kg5!
- 1...Sg3
- 1.Qxg6?
- threat
- 2.Sg2#
- 2.Qxh6#
- 1...dxc3
- 2.Rxe4#
- 1...d3
- 2.Rxe4#
- 1...Sg4
- 2.Sg2#
- 2.Qf5#
- 2.Qxg4#
- 1...Sf5
- 2.Sg2#
- 2.Qxf5#
- 2.Qg4#
- 1...Sg8
- 2.Sg2#
- 2.Qf5#
- 2.Qg4#
- 1...e3
- 2.Sd3#
- 1...fxg6!
- threat
- 1.Sd3+?
- Keys
- 1.Qg1!
- 1...dxc3
- 2.Sd3#
- 1...Sg3
- 2.Qxg3#
- 1...Sg4
- 2.Qxg4#
- 1...e3
- 2.Qxe3#
- 1...Bc2
- 2.Sxe2#
- 1...Bb3
- 2.Sxe2#
- 1...Ba4
- 2.Sxe2#
- 1...Sf2
- 2.Qg3#
- 1...Sf5
- 2.Qg4#
- 1...Sg8
- 2.Qg4#
- 1...d3
- 2.Sxd3#
- 1...g5
- 2.Sg2#
- 1...dxc3
- 1.Qg1!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 4
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- B(a);N_GUARD::S(A),XP(c)
- S(b);N_GUARD::QAB1(C)
- S(b);N_GUARD::QAB1(C),XS(b)
- S(j);N_GUARD::QAR1(C),XS(j)
- S(j);N_GUARD::QAR1(C)
- P(d);OGATE,P_SPINP(e),XR(D)::R1(F),XP(e)
- P(d);OGATE,P_SPINP(e)::R1(F),XP(e)
- P(e);N_GUARD,P_SPINP(d),SBLOCK::S(A)
- P(i);SBLOCK::QAR1(C),XP(e)
- Tries
- Try
- S(A);CHECK
- Vars
- K(f);S_FLIGHT::QAB(C)
- Refutation
- P(e);P_SPINP(d),XS(A)
- Try
- B(I);XP(i)
- Vars
- P(d);OGATE,P_SPINP(e),XR(D)::R1(F),XP(e)
- S(b);N_GUARD::QAB1(C),XS(b)
- S(j);N_GUARD::QAR1(C),XS(j)
- P(d);OGATE,P_SPINP(e)::R1(F),XP(e)
- B(a);N_GUARD::S(A),XP(c)
- S(b);N_GUARD::QAB1(C)
- S(j);N_GUARD::QAR1(C)
- P(e);N_GUARD,P_SPINP(d),SBLOCK::S(A)
- Refutation
- P(k);XB(I)
- Try
- B(I);
- Vars
- S(j);N_GUARD,XB(I)::QAR1(C)
- P(d);OGATE,P_SPINP(e),XR(D)::R1(F),XP(e)
- S(b);N_GUARD::QAB1(C),XS(b)
- S(j);N_GUARD::QAR1(C),XS(j)
- P(d);OGATE,P_SPINP(e)::R1(F),XP(e)
- B(a);N_GUARD::S(A),XP(c)
- S(b);N_GUARD::QAB1(C)
- S(j);N_GUARD::QAR1(C)
- P(e);N_GUARD,P_SPINP(d),SBLOCK::S(A)
- Refutation
- P(i);
- Try
- R(D);
- Vars
- S(b);N_GUARD::QAB1(C),XS(b)
- S(j);N_GUARD::QAR1(C),XS(j)
- P(d);OGATE,P_SPINP(e)::R1(F),XP(e)
- B(a);N_GUARD::S(A),XP(c)
- S(b);N_GUARD::QAB1(C)
- S(j);N_GUARD::QAR1(C)
- P(e);N_GUARD,P_SPINP(d),SBLOCK::S(A)
- P(i);SBLOCK::QAR1(C),XP(e)
- Refutation
- B(a);
- Try
- R(D);
- Vars
- S(b);N_GUARD::QAB1(C),XS(b)
- S(j);N_GUARD::QAR1(C),XS(j)
- P(d);OGATE,P_SPINP(e)::R1(F),XP(e)
- B(a);N_GUARD::S(A),XP(c)
- S(b);N_GUARD::QAB1(C)
- S(j);N_GUARD::QAR1(C)
- P(e);N_GUARD,P_SPINP(d),SBLOCK::S(A)
- P(i);SBLOCK::QAR1(C),XP(e)
- Refutation
- B(a);XR(D)
- Try
- R(F);
- Vars
- B(a);N_GUARD,XR(F)::S(A),XP(c)
- P(d);OGATE,P_SPINP(e),XR(D)::R1(F),XP(e)
- S(b);N_GUARD::QAB1(C),XS(b)
- S(j);N_GUARD::QAR1(C),XS(j)
- P(d);OGATE,P_SPINP(e)::R1(F),XP(e)
- B(a);N_GUARD::S(A),XP(c)
- S(b);N_GUARD::QAB1(C)
- S(j);N_GUARD::QAR1(C)
- P(e);N_GUARD,P_SPINP(d),SBLOCK::S(A)
- P(i);SBLOCK::QAR1(C),XP(e)
- Refutation
- P(g);
- Try
- Q(C);CHECK
- Vars
- S(b);N_GUARD,P_SPINS(b)::QAB1(C),XS(b)
- Refutation
- K(f);S_FLIGHT
- Try
- Q(C);XP(i)
- Threat
- DUALS(2)
- Vars
- P(d);OGATE,P_SPINP(e),XR(D)::R1(F),XP(e)
- P(d);OGATE,P_SPINP(e)::R1(F),XP(e)
- P(e);N_GUARD,P_SPINP(d),SBLOCK::S(A)
- Refutation
- P(k);XQ(C)
- Try
- Actual
- Q(C);
- Vars
- P(d);P_SPINP(e),XR(D)::S(A)
- S(b);N_GUARD::QAB1(C),XS(b)
- S(j);N_GUARD::QAR1(C),XS(j)
- P(e);P_SPINP(d)::QAB1(C),XP(e)
- B(a);N_GUARD::S(A),XP(c)
- S(b);N_GUARD::QAB1(C)
- S(j);N_GUARD::QAR1(C)
- P(d);P_SPINP(e)::S(A),XP(d)
- P(i);SBLOCK::S(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).