MESON Chess Problem Database
Problem Display
PID: 12300 (2nQ4/7q/5R1n/RbNBk3/5N2/2Pp2r1/3K3B/8 w - - 0 1)
Froberg, Johan Hilding Laurentius
Revista Romana de Sah, 1977
#2
9 + 7
SOLUTION
- SOUND
- Sets
- 1...Qg6
- 2.Sxg6#
- 1...Qa7
- 2.Sg6#
- 1...Qb7
- 2.Sg6#
- 1...Qc7
- 2.Sg6#
- 1...Qh8
- 2.Sg6#
- 1...Rg1
- 2.Sg2#
- 2.Sfxd3#
- 2.Sg6#
- 1...Rg2+
- 2.Sxg2#
- 1...Re3
- 2.Sfxd3#
- 2.Sg6#
- 1...Rf3
- 2.Sfxd3#
- 2.Sg6#
- 1...Rh3
- 2.Sfxd3#
- 2.Sxh3#
- 2.Sg6#
- 1...Rg4
- 2.Sfxd3#
- 2.Sg6#
- 1...Rg5
- 2.Sfxd3#
- 2.Sg6#
- 1...Rg6
- 2.Sfxd3#
- 2.Sxg6#
- 1...Rg7
- 2.Sfxd3#
- 2.Sg6#
- 1...Rg8
- 2.Sfxd3#
- 2.Sg6#
- 1...Sb6
- 2.Qd6#
- 1...Sd6
- 2.Qxd6#
- 1...Sa7
- 2.Qd6#
- 1...Se7
- 2.Qd6#
- 1...Qg6
- Tries
- 1.Sfxd3+?
- 1...Bxd3
- 2.Bxg3#
- 1...Qxd3+!
- 1...Bxd3
- 1.Sd7+?
- 1...Bxd7
- 2.Bc6#
- 1...Qxd7!
- 1...Bxd7
- 1.Bh1?
- threat
- 2.Qd4#
- 1...Rg2+
- 2.Sxg2#
- 1...Qe4
- 2.Sd7#
- 1...Qd7
- 2.Sg6#
- 2.Sxd7#
- 1...Bd7
- 2.Scxd3#
- 2.Sxd7#
- 1...Sd6
- 2.Qxd6#
- 1...Sf5!
- threat
- 1.Bg2?
- threat
- 2.Qd4#
- 1...Rxg2+
- 2.Sxg2#
- 1...Bd7
- 2.Scxd3#
- 2.Sxd7#
- 1...Qe4
- 2.Sd7#
- 1...Qd7
- 2.Sg6#
- 2.Sxd7#
- 1...Sd6
- 2.Qxd6#
- 1...Sf5!
- threat
- 1.Bc4?
- threat
- 2.Qd4#
- 1...Rg2+
- 2.Sxg2#
- 1...Sf5
- 2.Sfxd3#
- 1...Qe4
- 2.Sd7#
- 1...Qd7
- 2.Sg6#
- 1...Sd6
- 2.Qxd6#
- 1...Bd7!
- threat
- 1.Bc6?
- threat
- 2.Qd4#
- 1...Rg2+
- 2.Sxg2#
- 1...Qe4
- 2.Sd7#
- 1...Qd7
- 2.Sg6#
- 2.Sxd7#
- 1...Sd6
- 2.Qxd6#
- 1...Sf5!
- threat
- 1.Bb7?
- threat
- 2.Qd4#
- 1...Rg2+
- 2.Sxg2#
- 1...Bd7
- 2.Scxd3#
- 2.Sxd7#
- 1...Qe4
- 2.Sd7#
- 1...Qd7
- 2.Sg6#
- 2.Sxd7#
- 1...Sd6
- 2.Qxd6#
- 1...Sf5!
- threat
- 1.Ba8?
- threat
- 2.Qd4#
- 1...Rg2+
- 2.Sxg2#
- 1...Bd7
- 2.Scxd3#
- 2.Sxd7#
- 1...Qe4
- 2.Sd7#
- 1...Qd7
- 2.Sg6#
- 2.Sxd7#
- 1...Sd6
- 2.Qxd6#
- 1...Sf5!
- threat
- 1.Sfxd3+?
- Keys
- 1.Bf3!
- threat
- 2.Qd4#
- 1...Rg2+
- 2.Sxg2#
- 1...Sf5
- 2.Scxd3#
- 1...Bd7
- 2.Scxd3#
- 2.Sxd7#
- 1...Qe4
- 2.Sd7#
- 1...Qd7
- 2.Sg6#
- 2.Sxd7#
- 1...Sd6
- 2.Qxd6#
- threat
- 1.Bf3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 8
- Sets
- Q(f);N_GUARD::S(D),XQ(f)
- Q(f);N_GUARD::S(D)
- R(b);CHECK::B(B)+S(D),XR(b)
- S(g);N_GUARD::QAB1(I)
- S(g);N_GUARD::QAB1(I),XS(g)
- Tries
- Try
- S(D);CHECK,P_PINR(b),XP(a)
- Vars
- B(c);XS(D)::B(B),XR(b)
- Refutation
- Q(f);CHECK,XS(D)
- Try
- S(F);CHECK
- Vars
- B(c);S_CUTQ(f),XS(F)::R(E)+B(G)
- Refutation
- Q(f);XS(F)
- Try
- B(G);
- Threat
- QAB1(I)
- Vars
- R(b);CHECK::B(B)+S(D),XR(b)
- Q(f);N_GUARD::S(F)
- S(g);N_GUARD::QAB1(I),XS(g)
- Refutation
- S(e);
- Try
- B(G);
- Threat
- QAB1(I)
- Vars
- R(b);CHECK,XB(G)::B(B)+S(D),XR(b)
- Q(f);N_GUARD::S(F)
- S(g);N_GUARD::QAB1(I),XS(g)
- Refutation
- S(e);
- Try
- B(G);
- Threat
- QAB1(I)
- Vars
- R(b);CHECK::B(B)+S(D),XR(b)
- S(e);S_CUTQ(f)::S(D),XP(a)
- Q(f);N_GUARD,SBLOCK::S(F)
- Q(f);N_GUARD::S(D)
- S(g);N_GUARD::QAB1(I),XS(g)
- Refutation
- B(c);
- Try
- B(G);
- Threat
- QAB1(I)
- Vars
- R(b);CHECK::B(B)+S(D),XR(b)
- Q(f);N_GUARD::S(F)
- S(g);N_GUARD::QAB1(I),XS(g)
- Refutation
- S(e);
- Try
- B(G);
- Threat
- QAB1(I)
- Vars
- R(b);CHECK::B(B)+S(D),XR(b)
- Q(f);N_GUARD::S(F)
- S(g);N_GUARD::QAB1(I),XS(g)
- Refutation
- S(e);
- Try
- B(G);
- Threat
- QAB1(I)
- Vars
- R(b);CHECK::B(B)+S(D),XR(b)
- Q(f);N_GUARD::S(F)
- S(g);N_GUARD::QAB1(I),XS(g)
- Refutation
- S(e);
- Try
- Actual
- B(G);
- Threat
- QAB1(I)
- Vars
- R(b);CHECK::B(B)+S(D),XR(b)
- S(e);S_CUTQ(f)::S(F),XP(a)
- Q(f);N_GUARD::S(F)
- S(g);N_GUARD::QAB1(I),XS(g)
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