MESON Chess Problem Database
Problem Display
PID: 218424 (8/2Q3pB/3p2R1/1p1qp2p/1P5P/NNpk1b2/4pP2/4K3 w - - 0 1)
Langstaff, William A
British Chess Magazine, 1921
#2
9 + 10
SOLUTION
- SOUND
- Sets
- 1...Ke4
- 2.Rg4#
- 1...Qxb3
- 2.Rxd6#
- 1...Qc4
- 2.Rxd6#
- 1...Qe4
- 2.Rxd6#
- 1...Qc6
- 2.Rxd6#
- 1...Qb7
- 2.Rxd6#
- 1...Qf7
- 2.Rxd6#
- 1...Qa8
- 2.Rxd6#
- 1...Qg8
- 2.Rxd6#
- 1...Qc5
- 2.Rxd6#
- 1...Bh1
- 2.Rg3#
- 1...Bg2
- 2.Rg3#
- 1...Be4
- 2.Rg3#
- 1...c2
- 2.Qxc2#
- 1...Ke4
- Tries
- 1.Sc1+?
- 1...Ke4
- 2.Rg4#
- 1...Kd4!
- 1...Ke4
- 1.Rg3+?
- 1...Qe4
- 2.Rxf3#
- 2.Qxd6#
- 1...e4
- 2.Rxf3#
- 1...g6!
- 1...Qe4
- 1.Rg4+?
- 1...Qe4
- 2.Qxd6#
- 1...Be4
- 2.Rg3#
- 1...g6
- 2.Sc1#
- 1...e4!
- 1...Qe4
- 1.Rg5+?
- 1...Qe4
- 2.Qxd6#
- 1...Be4
- 2.Rg3#
- 1...e4
- 2.Rxd5#
- 1...g6!
- 1...Qe4
- 1.Rxd6+?
- 1...Be4
- 2.Rxd5#
- 1...e4
- 2.Rxd5#
- 1...g6!
- 1...Be4
- 1.Rf6+?
- 1...Qe4
- 2.Rxf3#
- 2.Rxd6#
- 2.Qxd6#
- 1...Be4
- 2.Rf3#
- 1...e4
- 2.Rxf3#
- 1...g6!
- 1...Qe4
- 1.Rxg7+?
- 1...Qe4
- 2.Qxd6#
- 1...Be4
- 2.Rg3#
- 1...e4!
- 1...Qe4
- 1.Qb6?
- threat
- 2.Qe3#
- 1...Ke4
- 2.Rg4#
- 1...Qe4
- 2.Sc1#
- 2.Rxd6#
- 1...Qc5
- 2.Rxd6#
- 1...Qd4!
- threat
- 1.Qxd6?
- 1...Ke4
- 2.Rg4#
- 1...Qxd6
- 2.Rxd6#
- 1...e4
- 2.Qxd5#
- 1...Qd4
- 2.Sc5#
- 1...Bh1
- 2.Rg3#
- 1...Bg2
- 2.Rg3#
- 1...Be4
- 2.Rg3#
- 1...Bg4
- 2.Qxd5#
- 1...c2!
- 1...Ke4
- 1.Qxc3+?
- 1...Ke4
- 2.Rg4#
- 1...Kxc3!
- 1...Ke4
- 1.Qc4+?
- 1...Qxc4
- 2.Rxd6#
- 1...bxc4!
- 1...Qxc4
- 1.Qa7?
- threat
- 2.Qe3#
- 1...Ke4
- 2.Rg4#
- 1...Qe4
- 2.Sc1#
- 2.Rxd6#
- 1...Qc5
- 2.Rxd6#
- 1...Qd4!
- threat
- 1.Qb7?
- 1...Ke4
- 2.Rg4#
- 1...Qxb3
- 2.Rxd6#
- 1...Qxb7
- 2.Rxd6#
- 1...e4
- 2.Qxd5#
- 1...Qc4
- 2.Rxd6#
- 2.Qxf3#
- 1...Qe4
- 2.Rxd6#
- 1...Qc6
- 2.Rxd6#
- 1...Qe6
- 2.Qxf3#
- 1...Qf7
- 2.Rxd6#
- 1...Qg8
- 2.Rxd6#
- 2.Qxf3#
- 1...Qd4
- 2.Sc1#
- 1...Qc5
- 2.Rxd6#
- 1...Bh1
- 2.Rg3#
- 1...Bg2
- 2.Rg3#
- 1...Be4
- 2.Rg3#
- 1...Bg4
- 2.Qxd5#
- 1...c2!
- 1...Ke4
- 1.Sc1+?
- Keys
- 1.Qc6!
- 1...Ke4
- 2.Rg4#
- 1...Qxb3
- 2.Rxd6#
- 1...Qxc6
- 2.Rxd6#
- 1...e4
- 2.Qxd5#
- 1...Qc4
- 2.Rxd6#
- 2.Qxf3#
- 1...Qe4
- 2.Rxd6#
- 1...Qe6
- 2.Qxf3#
- 1...Qf7
- 2.Rxd6#
- 1...Qg8
- 2.Rxd6#
- 2.Qxf3#
- 1...Qd4
- 2.Sc1#
- 1...Qc5
- 2.Rxd6#
- 1...Bh1
- 2.Rg3#
- 1...Bg2
- 2.Rg3#
- 1...Be4
- 2.Rg3#
- 1...Bg4
- 2.Qxd5#
- 1...c2
- 2.Qxc2#
- 1...Ke4
- 1.Qc6!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 4
- Sets
- K(c);S_FLIGHT::B(I)+R(G),DCHECK
- Q(f);XS(D)::B(I)+R(G),DCHECK,XP(i)
- Q(f);::B(I)+R(G),DCHECK,XP(i)
- Q(f);S_CUTB(d),S_CUTP(g),S_CUTP(j)::R(G),XP(i)
- B(d);::B(I)+R(G),DCHECK
- B(d);S_CUTP(g),S_CUTP(j),S_CUTQ(f)::R(G)
- P(b);OGATE::QAB1(H),XP(b)
- Tries
- Try
- S(D);CHECK
- Vars
- K(c);S_FLIGHT::B(I)+R(G),DCHECK
- Refutation
- K(c);P-FLIGHT
- Try
- R(G);CHECK,P_PINB(d)
- Vars
- P(g);P_SPINP(g)::R(G),XB(d)
- Refutation
- P(j);P_SPINP(j)
- Try
- R(G);CHECK
- Vars
- Q(f);P_SPINQ(f),S_CUTB(d),S_CUTP(g),S_CUTP(j)::QAR(H),XP(i)
- B(d);P_SPINB(d),S_CUTP(g),S_CUTP(j),S_CUTQ(f)::R(G)
- P(j);P_SPINP(j)::S(D)
- Refutation
- P(g);P_SPINP(g)
- Try
- R(G);CHECK
- Vars
- Q(f);P_SPINQ(f),S_CUTB(d),S_CUTP(g),S_CUTP(j)::QAR(H),XP(i)
- B(d);P_SPINB(d),S_CUTP(g),S_CUTP(j),S_CUTQ(f)::R(G)
- P(g);OGATE,P_SPINP(g)::R(G),XQ(f)
- Refutation
- P(j);P_SPINP(j)
- Try
- R(G);CHECK,P_PINQ(f),XP(i)
- Vars
- B(d);P_SPINB(d)::R(G),XQ(f)
- P(g);P_SPINP(g)::R(G),XQ(f)
- Refutation
- P(j);P_SPINP(j)
- Try
- R(G);CHECK
- Vars
- B(d);P_SPINB(d)::R(G)
- P(g);P_SPINP(g)::R(G),XB(d)
- Refutation
- P(j);P_SPINP(j)
- Try
- R(G);CHECK,XP(j)
- Vars
- Q(f);P_SPINQ(f),S_CUTB(d),S_CUTP(g)::QAR(H),XP(i)
- B(d);P_SPINB(d),S_CUTP(g),S_CUTQ(f)::R(G)
- Refutation
- P(g);P_SPINP(g)
- Try
- Q(H);
- Threat
- QAR1(H)
- Vars
- K(c);S_FLIGHT::B(I)+R(G),DCHECK
- Q(f);::B(I)+R(G),DCHECK,XP(i)
- Refutation
- Q(f);
- Try
- Q(H);P_PINQ(f),XP(i)
- Vars
- K(c);N_SPINQ(f),S_FLIGHT::B(I)+R(G),DCHECK
- Q(f);N_SPINQ(f),OGATE,XQ(H)::B(I)+R(G),DCHECK,XQ(f)
- P(g);S_CUTB(d)::QAR2(H),XQ(f)
- Q(f);::S(D)
- B(d);::B(I)+R(G),DCHECK
- B(d);S_CUTP(g),S_CUTP(j)::R(G)
- B(d);N_GUARD::QAR2(H),XQ(f)
- Refutation
- P(b);
- Try
- Q(H);CHECK,XP(b)
- Vars
- K(c);S_FLIGHT::B(I)+R(G),DCHECK
- Refutation
- K(c);P-FLIGHT,XQ(H)
- Try
- Q(H);CHECK
- Vars
- Q(f);XQ(H)::B(I)+R(G),DCHECK,XP(i)
- Refutation
- P(e);XQ(H)
- Try
- Q(H);
- Threat
- QAR1(H)
- Vars
- K(c);S_FLIGHT::B(I)+R(G),DCHECK
- Q(f);::B(I)+R(G),DCHECK,XP(i)
- Refutation
- Q(f);
- Try
- Q(H);
- Vars
- K(c);P_SPINQ(f),S_FLIGHT::B(I)+R(G),DCHECK
- Q(f);XS(D)::B(I)+R(G),DCHECK,XP(i)
- Q(f);XQ(H)::B(I)+R(G),DCHECK,XP(i)
- P(g);S_CUTB(d)::QAR2(H),XQ(f)
- Q(f);S_CUTB(d),S_CUTP(g),S_CUTP(j)::R(G),XP(i)
- Q(f);::B(I)+R(G),DCHECK,XP(i)
- Q(f);OGATE::QAR2(H),XB(d)
- Q(f);SBLOCK::S(D)
- B(d);::B(I)+R(G),DCHECK
- B(d);S_CUTP(g),S_CUTP(j),S_CUTQ(f)::R(G)
- B(d);N_GUARD::QAR2(H),XQ(f)
- Refutation
- P(b);
- Try
- Actual
- Q(H);
- Vars
- K(c);P_SPINQ(f),S_FLIGHT::B(I)+R(G),DCHECK
- Q(f);XS(D)::B(I)+R(G),DCHECK,XP(i)
- Q(f);XQ(H)::B(I)+R(G),DCHECK,XP(i)
- P(g);S_CUTB(d)::QAR2(H),XQ(f)
- Q(f);S_CUTB(d),S_CUTP(g),S_CUTP(j)::R(G),XP(i)
- Q(f);OGATE::QAR2(H),XB(d)
- Q(f);::B(I)+R(G),DCHECK,XP(i)
- Q(f);SBLOCK::S(D)
- B(d);::B(I)+R(G),DCHECK
- B(d);S_CUTP(g),S_CUTP(j),S_CUTQ(f)::R(G)
- B(d);N_GUARD::QAR2(H),XQ(f)
- P(b);OGATE::QAB1(H),XP(b)
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