MESON Chess Problem Database
Problem Display
PID: 67128 (8/2Q5/1P2K3/bN1R4/r2p2n1/3k4/3pR3/1b1B1N2 w - - 0 1)
Kopnin, Aleksey Grigorevich
2nd Prize, Sachove umeni (Ceskoslovensky sach), 1953
#2
8 + 7
SOLUTION
- SOUND
- Sets
- 1...Ra1
- 2.Rxd4#
- 1...Ra2
- 2.Rxd4#
- 1...Ra3
- 2.Rxd4#
- 1...Rb4
- 2.Qc3#
- 1...Rc4
- 2.Qh7#
- 1...Ba2
- 2.Qc2#
- 1...Bc2
- 2.Qxc2#
- 1...Bc3
- 2.Qxc3#
- 1...Bb4
- 2.Rxd4#
- 1...Bxb6
- 2.Qc3#
- 1...Sf2
- 2.Re3#
- 1...Sh2
- 2.Re3#
- 1...Se3
- 2.Rxe3#
- 1...Se5
- 2.Re3#
- 1...Sf6
- 2.Re3#
- 1...Sh6
- 2.Re3#
- 1...Ra1
- Tries
- 1.Kd6?
- 1...Bxb6
- 2.Qc3#
- 1...Se3
- 2.Rxe3#
- 1...Ra1
- 2.Rxd4#
- 1...Ra2
- 2.Rxd4#
- 1...Ra3
- 2.Rxd4#
- 1...Rb4
- 2.Qc3#
- 1...Rc4
- 2.Qh7#
- 1...Ba2
- 2.Qc2#
- 1...Bc2
- 2.Qxc2#
- 1...Bc3
- 2.Qxc3#
- 1...Sf2
- 2.Re3#
- 1...Sh2
- 2.Re3#
- 1...Se5
- 2.Re3#
- 1...Sf6
- 2.Re3#
- 1...Sh6
- 2.Re3#
- 1...Bb4+!
- 1...Bxb6
- 1.Ree5?
- threat
- 2.Be2#
- 1...Rc4
- 2.Qh7#
- 1...Bc3
- 2.Qxc3#
- 1...Se3
- 2.Rxe3#
- 1...Sxe5!
- threat
- 1.Rd6?
- 1...Bxb6
- 2.Qc3#
- 1...Se3
- 2.Rxe3#
- 1...Rc4
- 2.Qh7#
- 1...Ra1
- 2.Rxd4#
- 1...Ra2
- 2.Rxd4#
- 1...Ra3
- 2.Rxd4#
- 1...Rb4
- 2.Qc3#
- 1...Bc2
- 2.Qxc2#
- 1...Bc3
- 2.Qxc3#
- 1...Bb4
- 2.Rxd4#
- 1...Sf2
- 2.Re3#
- 1...Sh2
- 2.Re3#
- 1...Se5
- 2.Re3#
- 1...Sf6
- 2.Re3#
- 1...Sh6
- 2.Re3#
- 1...Ba2+!
- 1...Bxb6
- 1.Rd8?
- 1...Bxb6
- 2.Qc3#
- 1...Se3
- 2.Rxe3#
- 1...Rc4
- 2.Qh7#
- 1...Ra1
- 2.Rxd4#
- 1...Ra2
- 2.Rxd4#
- 1...Ra3
- 2.Rxd4#
- 1...Rb4
- 2.Qc3#
- 1...Bc2
- 2.Qxc2#
- 1...Bc3
- 2.Qxc3#
- 1...Bb4
- 2.Rxd4#
- 1...Sf2
- 2.Re3#
- 1...Sh2
- 2.Re3#
- 1...Se5
- 2.Re3#
- 1...Sf6
- 2.Re3#
- 1...Sh6
- 2.Re3#
- 1...Ba2+!
- 1...Bxb6
- 1.Qg3+?
- 1...Kc4
- 2.Qb3#
- 1...Se3!
- 1...Kc4
- 1.Qc5?
- 1...Bxb6
- 2.Qc3#
- 1...Se3
- 2.Rxe3#
- 1...Ra1
- 2.Rxd4#
- 2.Qxd4#
- 1...Ra2
- 2.Rxd4#
- 2.Qxd4#
- 1...Ra3
- 2.Rxd4#
- 2.Qxd4#
- 1...Rb4
- 2.Qc3#
- 1...Ba2
- 2.Qc2#
- 1...Bc2
- 2.Qxc2#
- 1...Bc3
- 2.Qxc3#
- 1...Bb4
- 2.Rxd4#
- 2.Qxd4#
- 1...Sf2
- 2.Re3#
- 1...Sh2
- 2.Re3#
- 1...Se5
- 2.Re3#
- 1...Sf6
- 2.Re3#
- 1...Sh6
- 2.Re3#
- 1...Rc4!
- 1...Bxb6
- 1.Qc6?
- 1...Bxb6
- 2.Qc3#
- 1...Se3
- 2.Rxe3#
- 1...Ra1
- 2.Rxd4#
- 1...Ra2
- 2.Rxd4#
- 1...Ra3
- 2.Rxd4#
- 1...Rb4
- 2.Qc3#
- 1...Ba2
- 2.Qc2#
- 1...Bc2
- 2.Qxc2#
- 1...Bc3
- 2.Qxc3#
- 1...Bb4
- 2.Rxd4#
- 1...Sf2
- 2.Re3#
- 1...Sh2
- 2.Re3#
- 1...Se5
- 2.Re3#
- 1...Sf6
- 2.Re3#
- 1...Sh6
- 2.Re3#
- 1...Rc4!
- 1...Bxb6
- 1.Qc8?
- 1...Bxb6
- 2.Qc3#
- 1...Se3
- 2.Rxe3#
- 1...Ra1
- 2.Rxd4#
- 1...Ra2
- 2.Rxd4#
- 1...Ra3
- 2.Rxd4#
- 1...Rb4
- 2.Qc3#
- 1...Ba2
- 2.Qc2#
- 1...Bc2
- 2.Qxc2#
- 1...Bc3
- 2.Qxc3#
- 1...Bb4
- 2.Rxd4#
- 1...Sf2
- 2.Re3#
- 1...Sh2
- 2.Re3#
- 1...Se5
- 2.Re3#
- 1...Sf6
- 2.Re3#
- 1...Sh6
- 2.Re3#
- 1...Rc4!
- 1...Bxb6
- 1.b7?
- 1...Se3
- 2.Rxe3#
- 1...Rc4
- 2.Qh7#
- 1...Ra1
- 2.Rxd4#
- 1...Ra2
- 2.Rxd4#
- 1...Ra3
- 2.Rxd4#
- 1...Rb4
- 2.Qc3#
- 1...Ba2
- 2.Qc2#
- 1...Bc2
- 2.Qxc2#
- 1...Bc3
- 2.Qxc3#
- 1...Bb4
- 2.Rxd4#
- 1...Bb6
- 2.Qc3#
- 1...Sf2
- 2.Re3#
- 1...Sh2
- 2.Re3#
- 1...Se5
- 2.Re3#
- 1...Sf6
- 2.Re3#
- 1...Sh6
- 2.Re3#
- 1...Bxc7!
- 1...Se3
- 1.Kd6?
- Keys
- 1.Sd6!
- 1...Bxb6
- 2.Rxd2#
- 1...Rc4
- 2.Qxc4#
- 1...Ra1
- 2.Qc4#
- 1...Ra2
- 2.Qc4#
- 1...Ra3
- 2.Qc4#
- 1...Rb4
- 2.Rxd2#
- 1...Ba2
- 2.Qc2#
- 1...Bc2
- 2.Qxc2#
- 1...Bc3
- 2.Qh7#
- 1...Bb4
- 2.Qc4#
- 1...Sf2
- 2.Re3#
- 1...Sh2
- 2.Re3#
- 1...Se3
- 2.Rxe3#
- 1...Se5
- 2.Re3#
- 1...Sf6
- 2.Re3#
- 1...Sh6
- 2.Re3#
- 1...Bxb6
- 1.Sd6!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 8
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- R(d);N_GUARD::R1(E),XP(e)
- R(d);S_CUTB(g)::QAR1(H)
- R(d);SBLOCK::QAB(H)
- B(a);N_GUARD,P_PINR(E)::QAB1(H)
- B(a);N_GUARD::QAB1(H),XB(a)
- B(g);N_GUARD::QAR1(H),XB(g)
- B(g);S_CUTR(d)::R1(E),XP(e)
- B(g);N_GUARD,XP(F)::QAR1(H)
- S(f);N_GUARD::R1(C)
- S(f);N_GUARD::R1(C),XS(f)
- Tries
- Try
- K(G);P-FLIGHT
- Vars
- B(g);N_GUARD,XP(F)::QAR1(H)
- S(f);N_GUARD::R1(C),XS(f)
- R(d);N_GUARD::R1(E),XP(e)
- R(d);S_CUTB(g)::QAR1(H)
- R(d);SBLOCK::QAB(H)
- B(a);N_GUARD::QAB1(H)
- B(a);N_GUARD::QAB1(H),XB(a)
- B(g);N_GUARD::QAR1(H),XB(g)
- S(f);N_GUARD::R1(C)
- Refutation
- B(g);CHECK
- Try
- R(C);
- Threat
- B(A)
- Vars
- R(d);SBLOCK::QAB(H)
- B(g);N_GUARD::QAR1(H),XB(g)
- S(f);N_GUARD::R1(C),XS(f)
- Refutation
- S(f);XR(C)
- Try
- R(E);
- Vars
- B(g);N_GUARD,XP(F)::QAR1(H)
- S(f);N_GUARD::R1(C),XS(f)
- R(d);SBLOCK::QAB(H)
- R(d);N_GUARD::R1(E),XP(e)
- R(d);S_CUTB(g)::QAR1(H)
- B(a);N_GUARD::QAB1(H),XB(a)
- B(g);N_GUARD::QAR1(H),XB(g)
- B(g);S_CUTR(d)::R1(E),XP(e)
- S(f);N_GUARD::R1(C)
- Refutation
- B(a);CHECK
- Try
- R(E);
- Vars
- B(g);N_GUARD,XP(F)::QAR1(H)
- S(f);N_GUARD::R1(C),XS(f)
- R(d);SBLOCK::QAB(H)
- R(d);N_GUARD::R1(E),XP(e)
- R(d);S_CUTB(g)::QAR1(H)
- B(a);N_GUARD::QAB1(H),XB(a)
- B(g);N_GUARD::QAR1(H),XB(g)
- B(g);S_CUTR(d)::R1(E),XP(e)
- S(f);N_GUARD::R1(C)
- Refutation
- B(a);CHECK
- Try
- Q(H);CHECK
- Vars
- K(c);N_SPINP(e),OGATE,S_FLIGHT::QAB1(H)
- Refutation
- S(f);P_SPINS(f)
- Try
- Q(H);
- Vars
- B(g);N_GUARD,XP(F)::QAR1(H)
- S(f);N_GUARD::R1(C),XS(f)
- R(d);S_CUTB(g)::QAR1(H)
- B(a);N_GUARD,P_PINR(E)::QAB1(H)
- B(a);N_GUARD::QAB1(H),XB(a)
- B(g);N_GUARD::QAR1(H),XB(g)
- S(f);N_GUARD::R1(C)
- Refutation
- R(d);
- Try
- Q(H);
- Vars
- B(g);N_GUARD,XP(F)::QAR1(H)
- S(f);N_GUARD::R1(C),XS(f)
- R(d);N_GUARD::R1(E),XP(e)
- R(d);S_CUTB(g)::QAR1(H)
- B(a);N_GUARD,P_PINR(E)::QAB1(H)
- B(a);N_GUARD::QAB1(H),XB(a)
- B(g);N_GUARD::QAR1(H),XB(g)
- B(g);S_CUTR(d)::R1(E),XP(e)
- S(f);N_GUARD::R1(C)
- Refutation
- R(d);
- Try
- Q(H);
- Vars
- B(g);N_GUARD,XP(F)::QAR1(H)
- S(f);N_GUARD::R1(C),XS(f)
- R(d);N_GUARD::R1(E),XP(e)
- R(d);S_CUTB(g)::QAR1(H)
- B(a);N_GUARD,P_PINR(E)::QAB1(H)
- B(a);N_GUARD::QAB1(H),XB(a)
- B(g);N_GUARD::QAR1(H),XB(g)
- B(g);S_CUTR(d)::R1(E),XP(e)
- S(f);N_GUARD::R1(C)
- Refutation
- R(d);
- Try
- P(F);
- Vars
- S(f);N_GUARD::R1(C),XS(f)
- R(d);SBLOCK::QAB(H)
- R(d);N_GUARD::R1(E),XP(e)
- R(d);S_CUTB(g)::QAR1(H)
- B(a);N_GUARD,P_PINR(E)::QAB1(H)
- B(a);N_GUARD::QAB1(H),XB(a)
- B(g);N_GUARD::QAR1(H),XB(g)
- B(g);S_CUTR(d)::R1(E),XP(e)
- B(g);N_GUARD::QAR1(H)
- S(f);N_GUARD::R1(C)
- Refutation
- B(g);XQ(H)
- Try
- Actual
- S(D);
- Vars
- B(g);N_GUARD,XP(F)::R1(C),XP(b)
- R(d);N_GUARD::QAB1(H),XR(d)
- R(d);N_GUARD::QAB1(H)
- R(d);S_CUTB(g)::R1(C),XP(b)
- B(a);N_GUARD,P_PINR(E)::QAB1(H)
- B(a);N_GUARD::QAB1(H),XB(a)
- B(g);SBLOCK::QAB(H)
- B(g);S_CUTR(d)::QAB1(H)
- S(f);N_GUARD::R1(C)
- S(f);N_GUARD::R1(C),XS(f)
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).