MESON Chess Problem Database
Problem Display
PID: 10877 (3R1B1K/1b6/6Q1/R3p3/npkN4/4P3/P2b4/3Nn3 w - - 0 1)
Jonsson, Gustav
Problem (Zagreb), 1969
#2
9 + 7
SOLUTION
- SOUND
- Sets
- 1...Bh1
- 2.Qa6#
- 1...Bg2
- 2.Qa6#
- 1...Bf3
- 2.Qa6#
- 1...Be4
- 2.Qa6#
- 1...Bd5
- 2.Qa6#
- 1...Ba6
- 2.Qxa6#
- 1...Ba8
- 2.Qa6#
- 1...Sb2
- 2.Rc5#
- 1...Sc3
- 2.Sb2#
- 2.Rc5#
- 1...Sc5
- 2.Rxc5#
- 1...Sb6
- 2.Rc5#
- 1...b3
- 2.axb3#
- 1...exd4
- 2.Rxd4#
- 1...Bh1
- Tries
- 1.Sb2+?
- 1...Sxb2
- 2.Rc5#
- 1...Kc3!
- 1...Sxb2
- 1.Sf3?
- threat
- 2.Sxd2#
- 2.Sxe5#
- 1...Bxe3
- 2.Sxe5#
- 1...Bxf3
- 2.Qa6#
- 1...Sxf3
- 2.Qd3#
- 1...Bc1
- 2.Sxe5#
- 1...Sd3
- 2.Sxd2#
- 2.Qxd3#
- 1...e4
- 2.Sxd2#
- 2.Se5#
- 2.Rd4#
- 1...Bc3!
- threat
- 1.Sf5?
- threat
- 2.Sd6#
- 1...Bxe3
- 2.Sfxe3#
- 1...Be4
- 2.Qa6#
- 1...Sc5
- 2.Rxc5#
- 1...e4
- 2.Rd4#
- 1...b3!
- threat
- 1.Sc6?
- threat
- 2.Sxe5#
- 2.Qe4#
- 2.Qf7#
- 2.Qe6#
- 2.Qg8#
- 1...Bxe3
- 2.Sxe5#
- 2.Qf7#
- 2.Qe6#
- 2.Qg8#
- 1...Bc3
- 2.Qf7#
- 2.Qe6#
- 2.Qg8#
- 1...Bc8
- 2.Sxe5#
- 2.Qe4#
- 1...Sc2
- 2.Sxe5#
- 2.Qd3#
- 2.Qf7#
- 2.Qe6#
- 2.Qg8#
- 1...Sd3
- 2.Qxd3#
- 2.Qe4#
- 2.Qf7#
- 2.Qe6#
- 2.Qg8#
- 1...Sf3
- 2.Qd3#
- 2.Qf7#
- 2.Qe6#
- 2.Qg8#
- 1...Sc3
- 2.Sb2#
- 2.Sxe5#
- 2.Rc5#
- 1...Sc5
- 2.Sxe5#
- 2.Rxc5#
- 1...Sb6
- 2.Sxe5#
- 2.Rc5#
- 2.Qe4#
- 1...e4
- 2.Se5#
- 2.Rd4#
- 2.Qxe4#
- 2.Qf7#
- 2.Qe6#
- 2.Qg8#
- 1...Bxc6!
- threat
- 1.Qb1?
- threat
- 2.Qb3#
- 1...Sb2
- 2.Rc5#
- 1...Sc3
- 2.Sb2#
- 2.Rc5#
- 1...Sc5
- 2.Rxc5#
- 1...b3
- 2.Qxb3#
- 2.axb3#
- 1...Bc3!
- threat
- 1.Qe6+?
- 1...Bd5
- 2.Qa6#
- 1...Kd3!
- 1...Bd5
- 1.Sb2+?
- Keys
- 1.Sb5!
- threat
- 2.Sd6#
- 1...Bxe3
- 2.Sxe3#
- 1...Be4
- 2.Qxe4#
- 1...Sc5
- 2.Sb2#
- 1...b3
- 2.Sa3#
- 1...e4
- 2.Rd4#
- threat
- 1.Sb5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 3
- ADDED MATES = 2
- REMOVED MATES = 9
- Sets
- B(g);N_GUARD::QAB(F)
- B(g);N_GUARD::QAB(F),XB(g)
- S(c);N_GUARD::R1(E)
- S(c);N_GUARD::R1(E),XS(c)
- P(d);OGATE::P(B),XP(d)
- P(f);OGATE,XS(D)::R1(G),XP(f)
- Tries
- Try
- S(A);CHECK
- Vars
- S(c);XS(A)::R1(E)
- Refutation
- K(e);P-FLIGHT
- Try
- S(D);
- Threat
- DUALS(2)
- Vars
- B(b);XP(C)::S(D),XP(f)
- B(g);N_GUARD,XS(D)::QAB(F)
- S(a);N_GUARD,XS(D)::QAB1(F)
- B(b);::S(D),XP(f)
- Refutation
- B(b);
- Try
- S(D);
- Threat
- S(D)
- Vars
- B(b);XP(C)::S(D),XB(b)
- B(g);N_GUARD::QAB(F)
- S(c);N_GUARD::R1(E),XS(c)
- P(f);N_GUARD::R1(G)
- Refutation
- P(d);
- Try
- S(D);
- Threat
- DUALS(5)
- Refutation
- B(g);XS(D)
- Try
- Q(F);
- Threat
- QAB1(F)
- Vars
- S(c);N_GUARD::R1(E)
- S(c);N_GUARD::R1(E),XS(c)
- Refutation
- B(b);
- Try
- Q(F);CHECK
- Vars
- B(g);N_GUARD,P_SPINB(g)::QAB(F)
- Refutation
- K(e);S_FLIGHT
- Try
- Actual
- S(D);
- Threat
- S(D)
- Vars
- B(b);XP(C)::S(A),XB(b)
- B(g);N_GUARD::QAR2(F),XB(g)
- S(c);N_GUARD::S(A)
- P(d);N_GUARD::S(D)
- P(f);N_GUARD::R1(G)
Developed and maintained by Brian Stephenson.
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