MESON Chess Problem Database
Problem Display
PID: 110784 (8/8/5p1B/3p1P1B/4pQ1R/1Kpk2P1/3pN3/3n4 w - - 0 1)
Birnov, Zinovy Markovich
4th HM., Chigorin MT, 1949-1950
#2
8 + 7
| 6490 | yacpdb | 2009 |
SOLUTION
- SOUND
- Sets
- 1...Sb2
- 2.Qe3#
- 1...Sf2
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 1...c2
- 2.Qxd2#
- 1...e3
- 2.Qd4#
- 1...d4
- 2.Qxe4#
- 1...Sb2
- Tries
- 1.Sg1?
- 1...Sb2
- 2.Qe3#
- 1...Sf2
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 1...c2
- 2.Qxd2#
- 1...e3
- 2.Be2#
- 2.Qd4#
- 1...d4
- 2.Be2#
- 2.Qf1#
- 2.Qxe4#
- 1...Kd4!
- 1...Sb2
- 1.Sxc3?
- threat
- 2.Qxd2#
- 1...Se3
- 2.Qxe3#
- 1...e3
- 2.Be2#
- 2.Qd4#
- 1...Kd4!
- threat
- 1.Sd4?
- 1...Sb2
- 2.Qe3#
- 1...Sf2
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 1...c2
- 2.Qxd2#
- 1...e3
- 2.Be2#
- 1...Kxd4!
- 1...Sb2
- 1.Bf3?
- 1...Sb2
- 2.Qe3#
- 1...Sf2
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 1...c2
- 2.Qxd2#
- 1...e3
- 2.Qd4#
- 1...d4
- 2.Qxe4#
- 1...exf3!
- 1...Sb2
- 1.Bg4?
- 1...Sb2
- 2.Qe3#
- 1...Sf2
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 1...c2
- 2.Qxd2#
- 1...e3
- 2.Qd4#
- 1...d4!
- 1...Sb2
- 1.Be8?
- threat
- 2.Bb5#
- 1...Sb2
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 1...Kxe2!
- threat
- 1.Bg5?
- 1...e3
- 2.Qd4#
- 1...Sb2
- 2.Qe3#
- 1...Sf2
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 1...c2
- 2.Qxd2#
- 1...d4
- 2.Qxe4#
- 1...fxg5!
- 1...e3
- 1.Rh1?
- 1...Sb2
- 2.Qe3#
- 1...Sf2
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 1...c2
- 2.Qxd2#
- 1...e3
- 2.Qd4#
- 1...d4!
- 1...Sb2
- 1.Rh2?
- 1...Sb2
- 2.Qe3#
- 1...Sf2
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 1...c2
- 2.Qxd2#
- 1...e3
- 2.Qd4#
- 1...d4!
- 1...Sb2
- 1.Rh3?
- 1...Sb2
- 2.Qe3#
- 1...Sf2
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 1...c2
- 2.Qxd2#
- 1...e3
- 2.Qd4#
- 1...d4!
- 1...Sb2
- 1.Qe5?
- threat
- 2.Qd4#
- 2.Qxd5#
- 1...d4
- 2.Qxd4#
- 2.Qxe4#
- 2.Qb5#
- 1...Se3
- 2.Sf4#
- 2.Qxc3#
- 2.Qd4#
- 1...fxe5!
- threat
- 1.Qd6?
- threat
- 2.Qxd5#
- 2.Qa6#
- 1...d4
- 2.Qxd4#
- 2.Qa6#
- 1...Sb2
- 2.Qxd5#
- 1...Se3!
- threat
- 1.Qf2?
- threat
- 2.Sf4#
- 2.Qd4#
- 1...Se3
- 2.Qxe3#
- 1...e3
- 2.Rd4#
- 1...d4
- 2.Sf4#
- 2.Qxd4#
- 1...Sxf2!
- threat
- 1.Qf3+?
- 1...Se3
- 2.Qxe3#
- 1...e3
- 2.Rd4#
- 2.Qxd5#
- 1...exf3!
- 1...Se3
- 1.Sg1?
- Keys
- 1.Qc7!
- 1...d4
- 2.Qc4#
- 1...Sb2
- 2.Qxc3#
- 1...Sf2
- 2.Qxc3#
- 1...Se3
- 2.Qxc3#
- 1...c2
- 2.Qxc2#
- 1...e3
- 2.Rd4#
- 1...d4
- 1.Qc7!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 6
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- S(a);N_GUARD::QAR1(D)
- S(a);N_GUARD::QAR1(D),XS(a)
- P(c);N_GUARD::QAR1(D),XP(b)
- P(e);OGATE::QAR1(D)
- P(f);N_GUARD::QAB1(D),XP(e)
- Tries
- Try
- S(A);
- Vars
- S(a);N_GUARD::QAR1(D)
- S(a);N_GUARD::QAR1(D),XS(a)
- P(c);N_GUARD::QAR1(D),XP(b)
- Refutation
- K(d);P-FLIGHT,P_SPINP(e)
- Try
- S(A);XP(c)
- Threat
- QAR1(D),XP(b)
- Vars
- S(a);N_GUARD::QAR1(D),XS(a)
- Refutation
- K(d);P-FLIGHT,P_SPINP(e)
- Try
- S(A);
- Vars
- S(a);N_GUARD::QAR1(D)
- S(a);N_GUARD::QAR1(D),XS(a)
- P(c);N_GUARD::QAR1(D),XP(b)
- P(e);::B(G)
- Refutation
- K(d);P-FLIGHT,P_SPINP(e),XS(A)
- Try
- B(G);
- Vars
- S(a);N_GUARD::QAR1(D)
- S(a);N_GUARD::QAR1(D),XS(a)
- P(c);N_GUARD::QAR1(D),XP(b)
- P(e);OGATE::QAR1(D)
- P(f);N_GUARD::QAB1(D),XP(e)
- Refutation
- P(e);XB(G)
- Try
- B(G);
- Vars
- S(a);N_GUARD::QAR1(D)
- S(a);N_GUARD::QAR1(D),XS(a)
- P(c);N_GUARD::QAR1(D),XP(b)
- P(e);OGATE::QAR1(D)
- Refutation
- P(f);
- Try
- B(G);
- Threat
- B(G)
- Vars
- S(a);N_GUARD::QAR1(D)
- S(a);N_GUARD::QAR1(D),XS(a)
- Refutation
- K(d);S_FLIGHT,XS(A)
- Try
- B(H);
- Vars
- P(e);OGATE::QAR1(D)
- S(a);N_GUARD::QAR1(D)
- S(a);N_GUARD::QAR1(D),XS(a)
- P(c);N_GUARD::QAR1(D),XP(b)
- P(f);N_GUARD::QAB1(D),XP(e)
- Refutation
- P(g);XB(H)
- Try
- R(E);
- Vars
- S(a);N_GUARD::QAR1(D)
- S(a);N_GUARD::QAR1(D),XS(a)
- P(c);N_GUARD::QAR1(D),XP(b)
- P(e);OGATE::QAR1(D)
- Refutation
- P(f);
- Try
- R(E);
- Vars
- S(a);N_GUARD::QAR1(D)
- S(a);N_GUARD::QAR1(D),XS(a)
- P(c);N_GUARD::QAR1(D),XP(b)
- P(e);OGATE::QAR1(D)
- Refutation
- P(f);
- Try
- R(E);
- Vars
- S(a);N_GUARD::QAR1(D)
- S(a);N_GUARD::QAR1(D),XS(a)
- P(c);N_GUARD::QAR1(D),XP(b)
- P(e);OGATE::QAR1(D)
- Refutation
- P(f);
- Try
- Q(D);
- Threat
- DUALS(2)
- Refutation
- P(g);XQ(D)
- Try
- Q(D);P_PINP(f)
- Threat
- DUALS(2)
- Vars
- S(a);::QAR2(D),XP(f)
- Refutation
- S(a);
- Try
- Q(D);
- Threat
- DUALS(2)
- Vars
- S(a);N_GUARD::QAR1(D),XS(a)
- P(e);OGATE::R1(E)
- Refutation
- S(a);XQ(D)
- Try
- Q(D);CHECK
- Vars
- S(a);N_GUARD,P_SPINS(a)::QAR1(D),XS(a)
- Refutation
- P(e);XQ(D)
- Try
- Actual
- Q(D);
- Vars
- P(f);N_GUARD::QAB1(D)
- S(a);N_GUARD::QAR1(D),XP(c)
- P(c);OGATE::QAB1(D),XP(c)
- P(e);OGATE::R1(E)
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).