MESON Chess Problem Database
Problem Display
PID: 6769 (8/8/5Q2/8/8/1B6/rPK2p2/k7 w - - 0 1)
Lebedev, Aleksandr N
La Strategie, 1933
#2
4 + 3
| 2012 | Miniature Chess Problems from Many Countries | 1981 |
| 3296 | Shakhmatny zadachi miniaturi | 1987 |
| 3813 | 300 Sachmatu Uzdaviniu | 1991 |
| 3713 | Snap | 2007 |
| 145 | StrateGems | 2007 |
SOLUTION
- SOUND
- Sets
- 1...Rxb2+
- 2.Qxb2#
- 1...Ra3
- 2.bxa3#
- 1...Ra6
- 2.Qxa6#
- 1...f1Q
- 2.Qxf1#
- 1...f1S
- 2.Qxf1#
- 1...f1B
- 2.Qxf1#
- 1...f1R
- 2.Qxf1#
- 1...Rxb2+
- Tries
- 1.Bc4?
- 1...Rxb2+
- 2.Qxb2#
- 1...f1Q
- 2.Qxf1#
- 1...f1S
- 2.Qxf1#
- 1...f1B
- 2.Qxf1#
- 1...f1R
- 2.Qxf1#
- 1...Ra3
- 2.bxa3#
- 1...Ra4
- 2.b4#
- 1...Ra6
- 2.Qxa6#
- 1...Ra7
- 2.b4#
- 1...Ra8
- 2.b4#
- 1...Ra5!
- 1...Rxb2+
- 1.Be6?
- 1...Rxb2+
- 2.Qxb2#
- 1...f1Q
- 2.Qxf1#
- 1...f1S
- 2.Qxf1#
- 1...f1B
- 2.Qxf1#
- 1...f1R
- 2.Qxf1#
- 1...Ra3
- 2.bxa3#
- 1...Ra4
- 2.b4#
- 1...Ra6
- 2.b4#
- 1...Ra7
- 2.b4#
- 1...Ra8
- 2.b4#
- 1...Ra5!
- 1...Rxb2+
- 1.Bf7?
- 1...Rxb2+
- 2.Qxb2#
- 1...f1Q
- 2.Qxf1#
- 1...f1S
- 2.Qxf1#
- 1...f1B
- 2.Qxf1#
- 1...f1R
- 2.Qxf1#
- 1...Ra3
- 2.bxa3#
- 1...Ra4
- 2.b4#
- 1...Ra6
- 2.Qxa6#
- 1...Ra7
- 2.b4#
- 1...Ra8
- 2.b4#
- 1...Ra5!
- 1...Rxb2+
- 1.Bg8?
- 1...Rxb2+
- 2.Qxb2#
- 1...f1Q
- 2.Qxf1#
- 1...f1S
- 2.Qxf1#
- 1...f1B
- 2.Qxf1#
- 1...f1R
- 2.Qxf1#
- 1...Ra3
- 2.bxa3#
- 1...Ra4
- 2.b4#
- 1...Ra6
- 2.Qxa6#
- 1...Ra7
- 2.b4#
- 1...Ra8
- 2.b4#
- 1...Ra5!
- 1...Rxb2+
- 1.Qf3?
- threat
- 2.Qd1#
- 1...f1Q
- 2.Qxf1#
- 1...f1R
- 2.Qxf1#
- 1...Rxb2+!
- threat
- 1.Qf4?
- threat
- 2.Qc1#
- 1...f1Q
- 2.Qxf1#
- 1...f1R
- 2.Qxf1#
- 1...Rxb2+!
- threat
- 1.Qa6?
- threat
- 2.Qf1#
- 2.Qxa2#
- 1...f1Q
- 2.Qxf1#
- 2.Qxa2#
- 1...f1S
- 2.Qxf1#
- 2.Qxa2#
- 1...f1B
- 2.Qxf1#
- 2.Qxa2#
- 1...f1R
- 2.Qxf1#
- 2.Qxa2#
- 1...Ra3
- 2.Qf1#
- 2.Qxa3#
- 1...Ra4
- 2.Qf1#
- 2.Qxa4#
- 1...Ra5
- 2.Qf1#
- 2.Qxa5#
- 1...Rxa6!
- threat
- 1.Bc4?
- Keys
- 1.Bd5!
- 1...Rxb2+
- 2.Qxb2#
- 1...f1Q
- 2.Qxf1#
- 1...f1S
- 2.Qxf1#
- 1...f1B
- 2.Qxf1#
- 1...f1R
- 2.Qxf1#
- 1...Ra3
- 2.bxa3#
- 1...Ra4
- 2.b4#
- 1...Ra5
- 2.b4#
- 1...Ra6
- 2.Qxa6#
- 1...Ra7
- 2.b4#
- 1...Ra8
- 2.b4#
- 1...Rxb2+
- 1.Bd5!
This anticipates 11444(1938)
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 0
- Sets
- R(b);CHECK,OGATE,P_SPINR(b),XP(A)::QAB1(D),XR(b)
- R(b);N_PINP(A)::QAB(D)+P(A),XR(b)
- R(b);N_PINP(A),OGATEB::QAR(D),XR(b)
- P(c);OGATE::QAR(D),XQ(c)
- P(c);OGATE::QAR(D),XS(c)
- P(c);OGATE::QAR(D),XB(c)
- P(c);OGATE::QAR(D),XR(c)
- Tries
- Try
- B(C);
- Vars
- R(b);CHECK,OGATE,P_SPINR(b),XP(A)::QAB1(D),XR(b)
- P(c);OGATE::QAR(D),XQ(c)
- P(c);OGATE::QAR(D),XS(c)
- P(c);OGATE::QAR(D),XB(c)
- P(c);OGATE::QAR(D),XR(c)
- R(b);N_PINP(A)::QAB(D)+P(A),XR(b)
- R(b);N_PINP(A)::QAB(D)+P(A)
- R(b);N_PINP(A),OGATEB::QAR(D),XR(b)
- Refutation
- R(b);N_PINP(A)
- Try
- B(C);
- Vars
- R(b);CHECK,OGATE,P_SPINR(b),XP(A)::QAB1(D),XR(b)
- P(c);OGATE::QAR(D),XQ(c)
- P(c);OGATE::QAR(D),XS(c)
- P(c);OGATE::QAR(D),XB(c)
- P(c);OGATE::QAR(D),XR(c)
- R(b);N_PINP(A)::QAB(D)+P(A),XR(b)
- R(b);N_PINP(A)::QAB(D)+P(A)
- Refutation
- R(b);N_PINP(A)
- Try
- B(C);
- Vars
- R(b);CHECK,OGATE,P_SPINR(b),XP(A)::QAB1(D),XR(b)
- P(c);OGATE::QAR(D),XQ(c)
- P(c);OGATE::QAR(D),XS(c)
- P(c);OGATE::QAR(D),XB(c)
- P(c);OGATE::QAR(D),XR(c)
- R(b);N_PINP(A)::QAB(D)+P(A),XR(b)
- R(b);N_PINP(A)::QAB(D)+P(A)
- R(b);N_PINP(A),OGATEB::QAR(D),XR(b)
- Refutation
- R(b);N_PINP(A)
- Try
- B(C);
- Vars
- R(b);CHECK,OGATE,P_SPINR(b),XP(A)::QAB1(D),XR(b)
- P(c);OGATE::QAR(D),XQ(c)
- P(c);OGATE::QAR(D),XS(c)
- P(c);OGATE::QAR(D),XB(c)
- P(c);OGATE::QAR(D),XR(c)
- R(b);N_PINP(A)::QAB(D)+P(A),XR(b)
- R(b);N_PINP(A)::QAB(D)+P(A)
- R(b);N_PINP(A),OGATEB::QAR(D),XR(b)
- Refutation
- R(b);N_PINP(A)
- Try
- Q(D);
- Threat
- QAR(D)
- Vars
- P(c);OGATE::QAR(D),XQ(c)
- P(c);OGATE::QAR(D),XR(c)
- Refutation
- R(b);CHECK,XP(A)
- Try
- Q(D);
- Threat
- QAR2(D)
- Vars
- P(c);OGATE::QAR(D),XQ(c)
- P(c);OGATE::QAR(D),XR(c)
- Refutation
- R(b);CHECK,XP(A)
- Try
- Q(D);P_PINR(b)
- Threat
- DUALS(2)
- Refutation
- R(b);N_PINP(A),N_SPINR(b),XQ(D)
- Try
- Actual
- B(C);
- Vars
- R(b);CHECK,OGATE,P_SPINR(b),XP(A)::QAB1(D),XR(b)
- P(c);OGATE::QAR(D),XQ(c)
- P(c);OGATE::QAR(D),XS(c)
- P(c);OGATE::QAR(D),XB(c)
- P(c);OGATE::QAR(D),XR(c)
- R(b);N_PINP(A)::QAB(D)+P(A),XR(b)
- R(b);N_PINP(A)::QAB(D)+P(A)
- R(b);N_PINP(A),OGATEB::QAR(D),XR(b)
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).