Meson Chess Problem Database

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Problem Display

PID: 67129 (8/3N1n2/2QN4/b2R4/r2p4/3k4/3pRPn1/1b1K4 w - - 0 1)

Kopnin, Aleksey Grigorevich

2nd Prize, Sachove umeni (Ceskoslovensky sach), 1953

7 + 8

SOLUTION

SOUND
Sets
- 1...Ra1
  - 2.Qc4#
- 1...Ra2
  - 2.Qc4#
- 1...Ra3
  - 2.Qc4#
- 1...Rb4
  - 2.Rxd2#
- 1...Rc4
  - 2.Qxc4#
- 1...Ba2
  - 2.Qc2#
- 1...Bc2+
  - 2.Qxc2#
- 1...Bc3
  - 2.Sc5#
- 1...Bb4
  - 2.Qc4#
- 1...Bb6
  - 2.Rxd2#
- 1...Bc7
  - 2.Rxd2#
- 1...Bd8
  - 2.Rxd2#
- 1...Se1
  - 2.Re3#
- 1...Se3+
  - 2.Rxe3#
- 1...Sf4
  - 2.Re3#
- 1...Sh4
  - 2.Re3#
- 1...Se5
  - 2.Sxe5#
- 1...Sg5
  - 2.Se5#
- 1...Sxd6
  - 2.Se5#
- 1...Sh6
  - 2.Se5#
- 1...Sd8
  - 2.Se5#
- 1...Sh8
  - 2.Se5#
Tries
- 1.Se4?
  - 1...Bc2+
    - 2.Qxc2#
  - 1...Se3+
    - 2.Rxe3#
  - 1...Ra1
    - 2.Qb5#
    - 2.Qa6#
  - 1...Ra2
    - 2.Qb5#
    - 2.Qa6#
  - 1...Ra3
    - 2.Qb5#
    - 2.Qa6#
  - 1...Rb4
    - 2.Qc3#
  - 1...Ba2
    - 2.Qc2#
  - 1...Bc3
    - 2.Qxc3#
  - 1...Bb4
    - 2.Qb5#
  - 1...Bb6
    - 2.Qc3#
  - 1...Bc7
    - 2.Qc3#
  - 1...Bd8
    - 2.Qc3#
  - 1...Se1
    - 2.Re3#
  - 1...Sf4
    - 2.Re3#
  - 1...Sh4
    - 2.Re3#
  - 1...Se5
    - 2.Sxe5#
  - 1...Sg5
    - 2.Se5#
  - 1...Sd6
    - 2.Se5#
  - 1...Sh6
    - 2.Se5#
  - 1...Sd8
    - 2.Se5#
  - 1...Sh8
    - 2.Se5#
  - 1...Rc4!
- 1.Rxa5?
  - threat
    - 2.Rxd2#
  - 1...Bc2+
    - 2.Qxc2#
  - 1...Rc4
    - 2.Qxc4#
  - 1...Ra2
    - 2.Qc4#
  - 1...Se3+!
- 1.Qxa4?
  - threat
    - 2.Qc4#
    - 2.Qxd4#
  - 1...Bc2+
    - 2.Qxc2#
  - 1...Se3+
    - 2.Rxe3#
  - 1...Kc3
    - 2.Qa3#
  - 1...Sxd6
    - 2.Qxd4#
  - 1...Ba2
    - 2.Qc2#
    - 2.Qxd4#
  - 1...Bc3
    - 2.Sc5#
    - 2.Qb5#
    - 2.Qc4#
    - 2.Qa6#
  - 1...Bb6
    - 2.Qb3#
    - 2.Qa3#
    - 2.Qc4#
  - 1...Se5
    - 2.Qxd4#
  - 1...Bb4!
- 1.Qb5+?
  - 1...Rc4
    - 2.Qxc4#
  - 1...Kc3!
- 1.Qc3+?
  - 1...Bxc3
    - 2.Sc5#
  - 1...Kxc3!
- 1.Qc5?
  - 1...Bc2+
    - 2.Qxc2#
  - 1...Se3+
    - 2.Rxe3#
  - 1...Sxd6
    - 2.Se5#
  - 1...Rc4
    - 2.Qxc4#
  - 1...Rb4
    - 2.Rxd2#
  - 1...Ra1
    - 2.Rxd4#
    - 2.Qxd4#
    - 2.Qc4#
  - 1...Ra2
    - 2.Rxd4#
    - 2.Qxd4#
    - 2.Qc4#
  - 1...Ra3
    - 2.Rxd4#
    - 2.Qxd4#
    - 2.Qc4#
  - 1...Ba2
    - 2.Qc2#
  - 1...Bb4
    - 2.Rxd4#
    - 2.Qxd4#
    - 2.Qc4#
  - 1...Bb6
    - 2.Rxd2#
  - 1...Bc7
    - 2.Rxd2#
  - 1...Bd8
    - 2.Rxd2#
  - 1...Se1
    - 2.Re3#
  - 1...Sf4
    - 2.Re3#
  - 1...Sh4
    - 2.Re3#
  - 1...Se5
    - 2.Sxe5#
  - 1...Sg5
    - 2.Se5#
  - 1...Sh6
    - 2.Se5#
  - 1...Sd8
    - 2.Se5#
  - 1...Sh8
    - 2.Se5#
  - 1...Bc3!
- 1.Qa6+?
  - 1...Rc4
    - 2.Qxc4#
  - 1...Kc3!
- 1.Qc7?
  - 1...Bc2+
    - 2.Qxc2#
  - 1...Se3+
    - 2.Rxe3#
  - 1...Sxd6
    - 2.Se5#
  - 1...Rc4
    - 2.Qxc4#
  - 1...Rb4
    - 2.Rxd2#
  - 1...Ra1
    - 2.Qc4#
  - 1...Ra2
    - 2.Qc4#
  - 1...Ra3
    - 2.Qc4#
  - 1...Ba2
    - 2.Qc2#
  - 1...Bc3
    - 2.Sc5#
  - 1...Bb4
    - 2.Qc4#
  - 1...Bb6
    - 2.Rxd2#
  - 1...Se1
    - 2.Re3#
  - 1...Sf4
    - 2.Re3#
  - 1...Sh4
    - 2.Re3#
  - 1...Se5
    - 2.Sxe5#
  - 1...Sg5
    - 2.Se5#
  - 1...Sh6
    - 2.Se5#
  - 1...Sd8
    - 2.Se5#
  - 1...Sh8
    - 2.Se5#
  - 1...Bxc7!
- 1.Qc8?
  - 1...Bc2+
    - 2.Qxc2#
  - 1...Se3+
    - 2.Rxe3#
  - 1...Sxd6
    - 2.Se5#
  - 1...Rc4
    - 2.Qxc4#
  - 1...Rb4
    - 2.Rxd2#
  - 1...Ra1
    - 2.Qc4#
  - 1...Ra2
    - 2.Qc4#
  - 1...Ra3
    - 2.Qc4#
  - 1...Ba2
    - 2.Qc2#
  - 1...Bc3
    - 2.Sc5#
  - 1...Bb4
    - 2.Qc4#
  - 1...Bb6
    - 2.Rxd2#
  - 1...Bd8
    - 2.Rxd2#
  - 1...Se1
    - 2.Re3#
  - 1...Sf4
    - 2.Re3#
  - 1...Sh4
    - 2.Re3#
  - 1...Se5
    - 2.Sxe5#
  - 1...Sg5
    - 2.Se5#
  - 1...Sh6
    - 2.Se5#
  - 1...Sd8
    - 2.Se5#
  - 1...Sh8
    - 2.Se5#
  - 1...Bc7!
Keys
- 1.Sb5!
  - 1...Bc2+
    - 2.Qxc2#
  - 1...Se3+
    - 2.Rxe3#
  - 1...Ra1
    - 2.Rxd4#
  - 1...Ra2
    - 2.Rxd4#
  - 1...Ra3
    - 2.Rxd4#
  - 1...Rb4
    - 2.Qc3#
  - 1...Rc4
    - 2.Qg6#
  - 1...Ba2
    - 2.Qc2#
  - 1...Bc3
    - 2.Qxc3#
  - 1...Bb4
    - 2.Rxd4#
  - 1...Bb6
    - 2.Qc3#
  - 1...Bc7
    - 2.Qc3#
  - 1...Bd8
    - 2.Qc3#
  - 1...Se1
    - 2.Re3#
  - 1...Sf4
    - 2.Re3#
  - 1...Sh4
    - 2.Re3#
  - 1...Se5
    - 2.Sxe5#
  - 1...Sg5
    - 2.Se5#
  - 1...Sd6
    - 2.Se5#
  - 1...Sh6
    - 2.Se5#
  - 1...Sd8
    - 2.Se5#
  - 1...Sh8
    - 2.Se5#

FEATURES

Static
- TYPE = MUTATE
- CHANGED MATES = 10
- ADDED MATES = 0
- REMOVED MATES = 0
Sets
- R(e);N_GUARD::QAB1(E)
- R(e);S_CUTB(g)::R1(B),XP(b)
- R(e);N_GUARD::QAB1(E),XR(e)
- B(a);N_GUARD::QAB1(E)
- B(a);CHECK,N_GUARD::QAB1(E),XB(a)
- B(g);SBLOCK::S(G)
- B(g);S_CUTR(e)::QAB1(E)
- B(g);N_GUARD::R1(B),XP(b)
- S(c);N_GUARD::R1(B)
- S(c);CHECK,N_GUARD::R1(B),XS(c)
- S(h);N_GUARD::S(G),XS(h)
- S(h);N_GUARD::S(G)
- S(h);N_GUARD,XS(F)::S(G)
Tries
- Try
  - S(F);
  - Vars
    - B(a);CHECK,N_GUARD::QAB1(E),XB(a)
    - S(c);CHECK,N_GUARD::R1(B),XS(c)
    - R(e);S_CUTB(g)::QAR1(E)
    - B(a);N_GUARD::QAB1(E)
    - B(g);N_GUARD::QAR1(E),XB(g)
    - B(g);S_CUTR(e)::QAB(E)
    - B(g);N_GUARD::QAR1(E)
    - S(c);N_GUARD::R1(B)
    - S(h);N_GUARD::S(G),XS(h)
    - S(h);N_GUARD::S(G)
  - Refutation
    - R(e);
- Try
  - R(D);N_PINP(f),XB(g)
  - Threat
    - R1(B),XP(b)
  - Vars
    - B(a);CHECK,N_GUARD::QAB1(E),XB(a)
    - R(e);N_GUARD::QAB1(E),XR(e)
    - R(e);N_GUARD::QAB1(E)
  - Refutation
    - S(c);CHECK
- Try
  - Q(E);XR(e)
  - Threat
    - DUALS(2)
  - Vars
    - B(a);CHECK,N_GUARD::QAB1(E),XB(a)
    - S(c);CHECK,N_GUARD::R1(B),XS(c)
    - K(d);N_SPINP(f),P-FLIGHT::QAR2(E)
    - S(h);XS(F)::QAR1(E),XP(f)
    - S(h);::QAR1(E),XP(f)
  - Refutation
    - B(g);
- Try
  - Q(E);CHECK
  - Vars
    - R(e);N_GUARD,P_SPINR(e)::QAB1(E),XR(e)
  - Refutation
    - K(d);N_SPINP(f),P-FLIGHT
- Try
  - Q(E);CHECK
  - Vars
    - B(g);SBLOCK,XQ(E)::S(G)
  - Refutation
    - K(d);N_SPINP(f),P-FLIGHT,XQ(E)
- Try
  - Q(E);
  - Vars
    - B(a);CHECK,N_GUARD::QAB1(E),XB(a)
    - S(c);CHECK,N_GUARD::R1(B),XS(c)
    - S(h);N_GUARD,XS(F)::S(G)
    - R(e);N_GUARD::QAB1(E),XR(e)
    - R(e);S_CUTB(g)::R1(B),XP(b)
    - B(a);N_GUARD::QAB1(E)
    - B(g);N_GUARD::R1(B),XP(b)
    - S(c);N_GUARD::R1(B)
    - S(h);N_GUARD::S(G),XS(h)
    - S(h);N_GUARD::S(G)
  - Refutation
    - B(g);
- Try
  - Q(E);CHECK
  - Vars
    - R(e);N_GUARD,P_SPINR(e)::QAB1(E),XR(e)
  - Refutation
    - K(d);N_SPINP(f),P-FLIGHT
- Try
  - Q(E);
  - Vars
    - B(a);CHECK,N_GUARD::QAB1(E),XB(a)
    - S(c);CHECK,N_GUARD::R1(B),XS(c)
    - S(h);N_GUARD,XS(F)::S(G)
    - R(e);N_GUARD::QAB1(E),XR(e)
    - R(e);S_CUTB(g)::R1(B),XP(b)
    - R(e);N_GUARD::QAB1(E)
    - B(a);N_GUARD::QAB1(E)
    - B(g);SBLOCK::S(G)
    - B(g);S_CUTR(e)::QAB1(E)
    - B(g);N_GUARD::R1(B),XP(b)
    - S(c);N_GUARD::R1(B)
    - S(h);N_GUARD::S(G),XS(h)
    - S(h);N_GUARD::S(G)
  - Refutation
    - B(g);XQ(E)
- Try
  - Q(E);
  - Vars
    - B(a);CHECK,N_GUARD::QAB1(E),XB(a)
    - S(c);CHECK,N_GUARD::R1(B),XS(c)
    - S(h);N_GUARD,XS(F)::S(G)
    - R(e);N_GUARD::QAB1(E),XR(e)
    - R(e);S_CUTB(g)::R1(B),XP(b)
    - R(e);N_GUARD::QAB1(E)
    - B(a);N_GUARD::QAB1(E)
    - B(g);SBLOCK::S(G)
    - B(g);S_CUTR(e)::QAB1(E)
    - B(g);N_GUARD::R1(B),XP(b)
    - S(c);N_GUARD::R1(B)
    - S(h);N_GUARD::S(G),XS(h)
    - S(h);N_GUARD::S(G)
  - Refutation
    - B(g);
Actual
- S(F);
- Vars
  - B(a);CHECK,N_GUARD::QAB1(E),XB(a)
  - S(c);CHECK,N_GUARD::R1(B),XS(c)
  - R(e);N_GUARD::R1(D),XP(f)
  - R(e);S_CUTB(g)::QAR1(E)
  - R(e);SBLOCK::QAB(E)
  - B(a);N_GUARD::QAB1(E)
  - B(g);N_GUARD::QAR1(E),XB(g)
  - B(g);S_CUTR(e)::R1(D),XP(f)
  - B(g);N_GUARD::QAR1(E)
  - S(c);N_GUARD::R1(B)
  - S(h);N_GUARD::S(G),XS(h)
  - S(h);N_GUARD::S(G)

MESON Chess Problem Database

Problem Display

PID: 67129 (8/3N1n2/2QN4/b2R4/r2p4/3k4/3pRPn1/1b1K4 w - - 0 1)

SOLUTION

FEATURES