MESON Chess Problem Database
Problem Display
PID: 231373 (2n5/8/2p5/2NN1p2/P1k1rQ2/2P5/4PB1K/2RR1B2 w - - 0 1)
Maas, Johann H
Opdenoordt, Joseph J
De Maasbode, 1927
#2
11 + 5
| 6490 | yacpdb | 2021 |
SOLUTION
- SOUND
- Sets
- 1...Rd4
- 2.Qxd4#
- 1...Rxf4
- 2.e4#
- 1...Sb6
- 2.Sxb6#
- 1...Sd6
- 2.Sb6#
- 1...Sa7
- 2.Sb6#
- 1...Se7
- 2.Sb6#
- 1...Rd4
- Tries
- 1.Kg1?
- 1...Rxf4
- 2.e4#
- 1...Rd4
- 2.Qxd4#
- 1...Sb6
- 2.Sxb6#
- 1...Sd6
- 2.Sb6#
- 1...Sa7
- 2.Sb6#
- 1...Se7
- 2.Sb6#
- 1...cxd5!
- 1...Rxf4
- 1.Kh1?
- 1...Rxf4
- 2.e4#
- 1...Rd4
- 2.Qxd4#
- 1...Sb6
- 2.Sxb6#
- 1...Sd6
- 2.Sb6#
- 1...Sa7
- 2.Sb6#
- 1...Se7
- 2.Sb6#
- 1...cxd5!
- 1...Rxf4
- 1.Kg2?
- 1...Rxf4
- 2.e4#
- 1...Rd4
- 2.Qxd4#
- 1...Sb6
- 2.Sxb6#
- 1...Sd6
- 2.Sb6#
- 1...Sa7
- 2.Sb6#
- 1...Se7
- 2.Sb6#
- 1...cxd5!
- 1...Rxf4
- 1.Kg3?
- 1...Rxf4
- 2.e4#
- 1...Rd4
- 2.Qxd4#
- 1...Sb6
- 2.Sxb6#
- 1...Sd6
- 2.Sb6#
- 1...Sa7
- 2.Sb6#
- 1...Se7
- 2.Sb6#
- 1...cxd5!
- 1...Rxf4
- 1.Kh3?
- 1...Rxf4
- 2.e4#
- 1...Rd4
- 2.Qxd4#
- 1...Sb6
- 2.Sxb6#
- 1...Sd6
- 2.Sb6#
- 1...Sa7
- 2.Sb6#
- 1...Se7
- 2.Sb6#
- 1...cxd5!
- 1...Rxf4
- 1.Rb1?
- threat
- 2.Rb4#
- 1...Rd4
- 2.Qxd4#
- 1...cxd5!
- threat
- 1.Rc2?
- 1...Rxf4
- 2.e4#
- 1...Rd4
- 2.Qxd4#
- 1...Sb6
- 2.Sxb6#
- 1...Sd6
- 2.Sb6#
- 1...Sa7
- 2.Sb6#
- 1...Se7
- 2.Sb6#
- 1...cxd5!
- 1...Rxf4
- 1.Rd2?
- 1...Rxf4
- 2.e4#
- 1...Rd4
- 2.Qxd4#
- 1...Sb6
- 2.Sxb6#
- 1...Sd6
- 2.Sb6#
- 1...Sa7
- 2.Sb6#
- 1...Se7
- 2.Sb6#
- 1...cxd5!
- 1...Rxf4
- 1.Rd4+?
- 1...Rxd4
- 2.Qxd4#
- 1...Kxc5!
- 1...Rxd4
- 1.Qd2?
- threat
- 2.Qa2#
- 2.Qd3#
- 1...Re3
- 2.Qd4#
- 1...Rd4
- 2.Qxd4#
- 1...Rh4+!
- threat
- 1.Qe5?
- 1...Rxe2
- 2.Se3#
- 2.Bxe2#
- 2.Qd4#
- 2.Qf4#
- 2.Qxe2#
- 1...Rxe5
- 2.e4#
- 1...cxd5
- 2.Qxd5#
- 1...Re3
- 2.Sxe3#
- 2.Qd4#
- 1...Rd4
- 2.Se3#
- 2.Qxd4#
- 2.cxd4#
- 1...Sb6
- 2.Sxb6#
- 1...Rf4
- 2.Se3#
- 2.Qxf4#
- 2.e4#
- 1...Rg4
- 2.Se3#
- 2.e4#
- 1...Sd6
- 2.Sb6#
- 1...Sa7
- 2.Sb6#
- 1...Se7
- 2.Sb6#
- 1...f4
- 2.Qxe4#
- 1...Rh4+!
- 1...Rxe2
- 1.Qd6?
- threat
- 2.e3#
- 1...Rxe2
- 2.Se3#
- 2.Bxe2#
- 2.Rd4#
- 2.Qf4#
- 1...Sxd6
- 2.Sb6#
- 1...Re3
- 2.Sxe3#
- 2.Rd4#
- 1...Rd4
- 2.Se3#
- 2.Rxd4#
- 2.cxd4#
- 1...Rh4+!
- threat
- 1.Qxf5?
- threat
- 2.Qxe4#
- 1...Rxe2
- 2.Se3#
- 2.Bxe2#
- 2.Qd3#
- 2.Qe4#
- 2.Qg4#
- 2.Qf4#
- 1...cxd5
- 2.Qxd5#
- 1...Re3
- 2.Sxe3#
- 1...Rd4
- 2.Se3#
- 2.cxd4#
- 1...Rf4
- 2.Se3#
- 2.Qd3#
- 2.Qxf4#
- 2.e4#
- 1...Rg4
- 2.Se3#
- 2.Qd3#
- 2.Qxg4#
- 2.e4#
- 1...Re5
- 2.Qd3#
- 2.e4#
- 1...Re6
- 2.Qd3#
- 2.e4#
- 1...Re7
- 2.Qd3#
- 2.e4#
- 1...Re8
- 2.Qd3#
- 2.e4#
- 1...Sd6
- 2.Sb6#
- 1...Rh4+!
- threat
- 1.Kg1?
- Keys
- 1.Bd4!
- 1...Rxe2+
- 2.Bf2#
- 1...Kxd5
- 2.c4#
- 1...Rxd4
- 2.Qxd4#
- 1...Rxf4
- 2.Se3#
- 1...cxd5
- 2.e3#
- 1...Sb6
- 2.Sxb6#
- 1...Re3
- 2.Sxe3#
- 2.Bxe3#
- 1...Re5
- 2.e4#
- 1...Re6
- 2.e4#
- 1...Re7
- 2.e4#
- 1...Re8
- 2.e4#
- 1...Sd6
- 2.Sb6#
- 1...Sa7
- 2.Sb6#
- 1...Se7
- 2.Sb6#
- 1...Rxe2+
- 1.Bd4!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 1
- ADDED MATES = 7
- REMOVED MATES = 0
- Sets
- R(b);OGATE::QAR1(I),XR(b)
- R(b);N_SPINR(b),OGATE,XQ(I)::B(C)+P(D)
- S(e);N_GUARD::S(K),XS(e)
- S(e);N_GUARD::S(K)
- Tries
- Try
- K(F);S_FLIGHT
- Vars
- R(b);N_SPINR(b),OGATE,XQ(I)::B(C)+P(D)
- R(b);OGATE::QAR1(I),XR(b)
- S(e);N_GUARD::S(K),XS(e)
- S(e);N_GUARD::S(K)
- Refutation
- P(d);XS(K)
- Try
- K(F);P-FLIGHT
- Vars
- R(b);N_SPINR(b),OGATE,XQ(I)::B(C)+P(D)
- R(b);OGATE::QAR1(I),XR(b)
- S(e);N_GUARD::S(K),XS(e)
- S(e);N_GUARD::S(K)
- Refutation
- P(d);XS(K)
- Try
- K(F);P-FLIGHT
- Vars
- R(b);N_SPINR(b),OGATE,XQ(I)::B(C)+P(D)
- R(b);OGATE::QAR1(I),XR(b)
- S(e);N_GUARD::S(K),XS(e)
- S(e);N_GUARD::S(K)
- Refutation
- P(d);XS(K)
- Try
- K(F);S_FLIGHT
- Vars
- R(b);N_SPINR(b),OGATE,XQ(I)::B(C)+P(D)
- R(b);OGATE::QAR1(I),XR(b)
- S(e);N_GUARD::S(K),XS(e)
- S(e);N_GUARD::S(K)
- Refutation
- P(d);XS(K)
- Try
- K(F);P-FLIGHT
- Vars
- R(b);N_SPINR(b),OGATE,XQ(I)::B(C)+P(D)
- R(b);OGATE::QAR1(I),XR(b)
- S(e);N_GUARD::S(K),XS(e)
- S(e);N_GUARD::S(K)
- Refutation
- P(d);XS(K)
- Try
- R(A);
- Threat
- R1(A)
- Vars
- R(b);OGATE::QAR1(I),XR(b)
- Refutation
- P(d);XS(K)
- Try
- R(A);
- Vars
- R(b);N_SPINR(b),OGATE,XQ(I)::B(C)+P(D)
- R(b);OGATE::QAR1(I),XR(b)
- S(e);N_GUARD::S(K),XS(e)
- S(e);N_GUARD::S(K)
- Refutation
- P(d);XS(K)
- Try
- R(B);
- Vars
- R(b);N_SPINR(b),OGATE,XQ(I)::B(C)+P(D)
- R(b);OGATE::QAR1(I),XR(b)
- S(e);N_GUARD::S(K),XS(e)
- S(e);N_GUARD::S(K)
- Refutation
- P(d);XS(K)
- Try
- R(B);CHECK,N_PINR(b)
- Vars
- R(b);OGATE,P_SPINR(b),XR(B)::QAR1(I),XR(b)
- Refutation
- K(a);P-FLIGHT,XS(J)
- Try
- Q(I);N_PINR(b)
- Threat
- DUALS(2)
- Vars
- R(b);N_GUARD::QAR1(I)
- R(b);N_GUARD::QAR1(I),XR(b)
- Refutation
- R(b);CHECK
- Try
- Q(I);N_PINR(b)
- Vars
- R(b);OGATE,XQ(I)::B(C)+P(D)
- P(d);OGATE,XS(K)::QAB1(I),XP(d)
- S(e);N_GUARD::S(K),XS(e)
- S(e);N_GUARD::S(K)
- P(c);N_GUARD::QAR2(I),XR(b)
- Refutation
- R(b);CHECK
- Try
- Q(I);N_PINR(b)
- Threat
- B(C)+P(D)
- Vars
- S(e);N_GUARD,XQ(I)::S(K)
- Refutation
- R(b);CHECK
- Try
- Q(I);N_PINR(b),XP(c)
- Threat
- QAR2(I),XR(b)
- Vars
- P(d);OGATE,XS(K)::QAB1(I),XP(d)
- R(b);N_GUARD::S(K),XR(b)
- S(e);N_GUARD::S(K)
- Refutation
- R(b);CHECK
- Try
- Actual
- B(E);N_PINR(b)
- Vars
- R(b);CHECK,OGATEB,P_SPINR(b),XP(D)::QAR(I)+B(E)
- K(a);OGATE,S_FLIGHT,XS(K)::P(G)
- R(b);OGATE,P_SPINR(b),XB(E)::QAR1(I),XR(b)
- R(b);N_GUARD,XQ(I)::S(K)
- P(d);SBLOCK,XS(K)::B(C)+P(D)
- S(e);N_GUARD::S(K),XS(e)
- R(b);OGATE::B(C)+P(D)
- S(e);N_GUARD::S(K)
Developed and maintained by Brian Stephenson.
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