MESON Chess Problem Database
Problem Display
PID: 103442 (2br4/5p2/1R1p1P1p/2Pk1p1R/p1p3N1/K1P1QPp1/5nP1/6B1 w - - 0 1)
Anderson, John
Canadian Chess Championship, 1980
#2
11 + 11
| 6490 | yacpdb | 2009 |
SOLUTION
- SOUND
- Sets
- 1...Rd7
- 2.Rxf5#
- 1...Re8
- 2.Rxd6#
- 1...Rf8
- 2.Rxd6#
- 1...Rg8
- 2.Rxd6#
- 1...Rh8
- 2.Rxd6#
- 1...Ba6
- 2.Rxf5#
- 1...Be6
- 2.Qd4#
- 1...Bb7
- 2.Rxf5#
- 1...Bd7
- 2.Rxd6#
- 1...Sd1
- 2.Qe4#
- 1...Sh1
- 2.Qe4#
- 1...Sd3
- 2.Qe4#
- 1...Sh3
- 2.Qe4#
- 1...Se4
- 2.Qxe4#
- 1...Sxg4
- 2.Qe4#
- 1...dxc5
- 2.Qe5#
- 1...Rd7
- Tries
- 1.Ka2?
- 1...Sxg4
- 2.Qe4#
- 1...dxc5
- 2.Qe5#
- 1...Se4
- 2.Qxe4#
- 1...Rd7
- 2.Rxf5#
- 1...Re8
- 2.Rxd6#
- 1...Rf8
- 2.Rxd6#
- 1...Rg8
- 2.Rxd6#
- 1...Rh8
- 2.Rxd6#
- 1...Ba6
- 2.Rxf5#
- 1...Be6
- 2.Qd4#
- 1...Bb7
- 2.Rxf5#
- 1...Bd7
- 2.Rxd6#
- 1...Sd1
- 2.Qe4#
- 1...Sh1
- 2.Qe4#
- 1...Sd3
- 2.Qe4#
- 1...Sh3
- 2.Qe4#
- 1...a3!
- 1...Sxg4
- 1.Kxa4?
- 1...Sxg4
- 2.Qe4#
- 1...dxc5
- 2.Qe5#
- 1...Se4
- 2.Qxe4#
- 1...Rd7
- 2.Rxf5#
- 1...Re8
- 2.Rxd6#
- 1...Rf8
- 2.Rxd6#
- 1...Rg8
- 2.Rxd6#
- 1...Rh8
- 2.Rxd6#
- 1...Ba6
- 2.Rxf5#
- 1...Be6
- 2.Qd4#
- 1...Bb7
- 2.Rxf5#
- 1...Sd1
- 2.Qe4#
- 1...Sh1
- 2.Qe4#
- 1...Sd3
- 2.Qe4#
- 1...Sh3
- 2.Qe4#
- 1...Bd7+!
- 1...Sxg4
- 1.Sxf2?
- 1...dxc5
- 2.Qe4#
- 1...Rd7
- 2.Rxf5#
- 1...Re8
- 2.Rxd6#
- 1...Rf8
- 2.Rxd6#
- 1...Rg8
- 2.Rxd6#
- 1...Rh8
- 2.Rxd6#
- 1...Ba6
- 2.Rxf5#
- 1...Be6
- 2.Qd4#
- 1...Bb7
- 2.Rxf5#
- 1...Bd7
- 2.Rxd6#
- 1...gxf2!
- 1...dxc5
- 1.Sxh6?
- 1...Se4
- 2.Qxe4#
- 1...Rd7
- 2.Rxf5#
- 1...Re8
- 2.Rxd6#
- 1...Rf8
- 2.Rxd6#
- 1...Rg8
- 2.Rxd6#
- 1...Rh8
- 2.Rxd6#
- 1...Ba6
- 2.Rxf5#
- 1...Be6
- 2.Qd4#
- 1...Bb7
- 2.Rxf5#
- 1...Bd7
- 2.Rxd6#
- 1...Sd1
- 2.Qe4#
- 1...Sh1
- 2.Qe4#
- 1...Sd3
- 2.Qe4#
- 1...Sh3
- 2.Qe4#
- 1...Sg4
- 2.Qe4#
- 1...dxc5!
- 1...Se4
- 1.Bxf2?
- threat
- 2.Qe4#
- 1...Re8
- 2.Rxd6#
- 1...gxf2!
- threat
- 1.Ra6?
- 1...Sxg4
- 2.Qe4#
- 1...dxc5
- 2.Qe5#
- 1...Se4
- 2.Qxe4#
- 1...Rd7
- 2.Rxf5#
- 1...Re8
- 2.Rxd6#
- 1...Rf8
- 2.Rxd6#
- 1...Rg8
- 2.Rxd6#
- 1...Rh8
- 2.Rxd6#
- 1...Be6
- 2.Qd4#
- 1...Bb7
- 2.Rxf5#
- 1...Bd7
- 2.Rxd6#
- 1...Sd1
- 2.Qe4#
- 1...Sh1
- 2.Qe4#
- 1...Sd3
- 2.Qe4#
- 1...Sh3
- 2.Qe4#
- 1...Bxa6!
- 1...Sxg4
- 1.Qe4+?
- 1...Kxc5
- 2.Qc6#
- 2.Qd4#
- 1...Sxe4!
- 1...Kxc5
- 1.cxd6?
- threat
- 2.Qe5#
- 1...Sxg4
- 2.Qe4#
- 1...Se4
- 2.Qxe4#
- 1...Sd3
- 2.Qe4#
- 1...Re8!
- threat
- 1.Ka2?
- Keys
- 1.Qf4!
- 1...Kxc5
- 2.Qd4#
- 1...Ke6
- 2.Qxf5#
- 1...Sxg4
- 2.Qe4#
- 1...dxc5
- 2.Se3#
- 2.Qe5#
- 1...Rd7
- 2.Qxf5#
- 1...Re8
- 2.Qxd6#
- 1...Rf8
- 2.Qxd6#
- 1...Rg8
- 2.Qxd6#
- 1...Rh8
- 2.Qxd6#
- 1...Ba6
- 2.Qxf5#
- 1...Be6
- 2.Qd4#
- 1...Bb7
- 2.Qxf5#
- 1...Bd7
- 2.Qxd6#
- 1...Sd1
- 2.Qe4#
- 1...Sh1
- 2.Qe4#
- 1...Sd3
- 2.Qe4#
- 1...Sh3
- 2.Qe4#
- 1...Se4
- 2.Qxe4#
- 1...Kxc5
- 1.Qf4!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 8
- ADDED MATES = 2
- REMOVED MATES = 1
- Sets
- R(k);S_CUTB(j)::R(I),XP(f)
- R(k);N_GUARD::R1(J),XP(g)
- B(j);N_GUARD::R(I),XP(f)
- B(j);SBLOCK::QAR1(E)
- B(j);S_CUTR(k)::R1(J),XP(g)
- S(a);N_GUARD::QAB1(E)
- S(a);N_GUARD::QAB1(E),XS(a)
- S(a);N_GUARD,XS(G)::QAB1(E)
- P(g);N_GUARD,SBLOCK,XP(H)::QAR1(E)
- Tries
- Try
- K(C);P-FLIGHT
- Vars
- S(a);N_GUARD,XS(G)::QAB1(E)
- P(g);N_GUARD,SBLOCK,XP(H)::QAR1(E)
- S(a);N_GUARD::QAB1(E),XS(a)
- R(k);S_CUTB(j)::R(I),XP(f)
- R(k);N_GUARD::R1(J),XP(g)
- B(j);N_GUARD::R(I),XP(f)
- B(j);SBLOCK::QAR1(E)
- B(j);S_CUTR(k)::R1(J),XP(g)
- S(a);N_GUARD::QAB1(E)
- Refutation
- P(c);
- Try
- K(C);P-FLIGHT,XP(c)
- Vars
- S(a);N_GUARD,XS(G)::QAB1(E)
- P(g);N_GUARD,SBLOCK,XP(H)::QAR1(E)
- S(a);N_GUARD::QAB1(E),XS(a)
- R(k);S_CUTB(j)::R(I),XP(f)
- R(k);N_GUARD::R1(J),XP(g)
- B(j);N_GUARD::R(I),XP(f)
- B(j);SBLOCK::QAR1(E)
- S(a);N_GUARD::QAB1(E)
- Refutation
- B(j);CHECK
- Try
- S(G);XS(a)
- Vars
- P(g);SBLOCK,XP(H)::QAB1(E)
- R(k);S_CUTB(j)::R(I),XP(f)
- R(k);N_GUARD::R1(J),XP(g)
- B(j);N_GUARD::R(I),XP(f)
- B(j);SBLOCK::QAR1(E)
- B(j);S_CUTR(k)::R1(J),XP(g)
- Refutation
- P(b);XS(G)
- Try
- S(G);XP(h)
- Vars
- S(a);N_GUARD::QAB1(E),XS(a)
- R(k);S_CUTB(j)::R(I),XP(f)
- R(k);N_GUARD::R1(J),XP(g)
- B(j);N_GUARD::R(I),XP(f)
- B(j);SBLOCK::QAR1(E)
- B(j);S_CUTR(k)::R1(J),XP(g)
- S(a);N_GUARD::QAB1(E)
- Refutation
- P(g);XP(H)
- Try
- B(A);XS(a)
- Threat
- QAB1(E)
- Vars
- R(k);N_GUARD::R1(J),XP(g)
- Refutation
- P(b);XB(A)
- Try
- R(J);
- Vars
- S(a);N_GUARD,XS(G)::QAB1(E)
- P(g);N_GUARD,SBLOCK,XP(H)::QAR1(E)
- S(a);N_GUARD::QAB1(E),XS(a)
- R(k);S_CUTB(j)::R(I),XP(f)
- R(k);N_GUARD::R1(J),XP(g)
- B(j);SBLOCK::QAR1(E)
- B(j);N_GUARD::R(I),XP(f)
- B(j);S_CUTR(k)::R1(J),XP(g)
- S(a);N_GUARD::QAB1(E)
- Refutation
- B(j);XR(J)
- Try
- Q(E);CHECK
- Refutation
- S(a);XQ(E)
- Try
- P(H);XP(g)
- Threat
- QAR1(E)
- Vars
- S(a);N_GUARD,XS(G)::QAB1(E)
- S(a);N_GUARD::QAB1(E),XS(a)
- S(a);N_GUARD::QAB1(E)
- Refutation
- R(k);
- Try
- Actual
- Q(E);
- Vars
- K(e);P-FLIGHT,P_SPINS(a),XP(H)::QAB1(E)
- K(e);N_SPINP(f),P_SPINP(g),S_FLIGHT::QAB1(E),XP(f)
- S(a);N_GUARD,XS(G)::QAB1(E)
- R(k);S_CUTB(j)::QAR2(E),XP(f)
- R(k);N_GUARD::QAR1(E),XP(g)
- B(j);N_GUARD::QAR2(E),XP(f)
- B(j);SBLOCK::QAR1(E)
- B(j);S_CUTR(k)::QAR1(E),XP(g)
- S(a);N_GUARD::QAB1(E)
- S(a);N_GUARD::QAB1(E),XS(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).