MESON Chess Problem Database

Problem Display
PID: 261161 (4n2K/3p3Q/2rp2R1/2n1k1P1/6P1/4Bp2/B2Nprp1/6qb w - - 0 1)

Ahues, Herbert Siegfried Oskar

3rd HM., Neue Zurcher Zeitung, 1979

4n2K/3p3Q/2rp2R1/2n1k1P1/6P1/4Bp2/B2Nprp1/6qb

#2

8 + 12

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qh2
      • 2.Qxh2#
    • 1...Qa1
      • 2.Qh2#
    • 1...Qb1
      • 2.Qh2#
    • 1...Qc1
      • 2.Qh2#
    • 1...Qd1
      • 2.Qh2#
    • 1...Qe1
      • 2.Qh2#
    • 1...Qf1
      • 2.Qh2#
    • 1...Sd3
      • 2.Qe7#
    • 1...Sa4
      • 2.Qe7#
    • 1...Se4
      • 2.Qe7#
    • 1...Sa6
      • 2.Qe7#
    • 1...Sb7
      • 2.Qe7#
    • 1...Sc7
      • 2.Qg7#
    • 1...Sg7
      • 2.Qxg7#
  • Tries
    • 1.Sc4+?
      • 1...Ke4
        • 2.Rxd6#
      • 1...Kd5!
    • 1.Re6+?
      • 1...Sxe6
        • 2.Qe4#
        • 2.Qf5#
      • 1...dxe6!
    • 1.Rf6?
      • threat
        • 2.Rf5#
        • 2.Qf5#
      • 1...Sxf6
        • 2.Qf5#
      • 1...Sb3
        • 2.Qe4#
        • 2.Qf5#
      • 1...Qh2
        • 2.Rf5#
        • 2.Qxh2#
      • 1...Qb1
        • 2.Qh2#
      • 1...d5
        • 2.Qf5#
      • 1...Sg7!
    • 1.Rh6?
      • threat
        • 2.Qf5#
      • 1...Sg7
        • 2.Qxg7#
      • 1...Qb1!
    • 1.Rg7?
      • threat
        • 2.Qf5#
      • 1...Sxg7
        • 2.Qxg7#
      • 1...Qh2
        • 2.Qxh2#
      • 1...Qb1
        • 2.Qh2#
      • 1...d5!
    • 1.Rg8?
      • threat
        • 2.Qf5#
      • 1...Qh2
        • 2.Qxh2#
      • 1...Qb1
        • 2.Qh2#
      • 1...Sg7
        • 2.Qxg7#
      • 1...d5!
    • 1.Qf7?
      • threat
        • 2.Qd5#
        • 2.Qf4#
        • 2.Qf5#
      • 1...Qb1
        • 2.Qd5#
        • 2.Qf4#
      • 1...Sb3
        • 2.Qf5#
      • 1...Sd3
        • 2.Qd5#
        • 2.Qxe8#
        • 2.Qf5#
        • 2.Qe7#
      • 1...Se6
        • 2.Qf5#
      • 1...Sf6
        • 2.Qxf6#
      • 1...Sc7
        • 2.Qf4#
        • 2.Qf5#
        • 2.Qf6#
        • 2.Qg7#
      • 1...Sg7
        • 2.Qd5#
        • 2.Qf4#
        • 2.Qf6#
        • 2.Qxg7#
      • 1...d5
        • 2.Qxd5#
        • 2.Qf4#
        • 2.Qf5#
      • 1...Qh2+!
    • 1.Qg7+?
      • 1...Sf6
        • 2.Qxf6#
      • 1...Sxg7!
  • Keys
    • 1.Rxd6!
      • threat
        • 2.Sc4#
      • 1...Kxd6
        • 2.Bf4#
      • 1...Rxd6
        • 2.Qf5#
      • 1...Sxd6
        • 2.Qg7#
      • 1...Qc1
        • 2.Qh2#
      • 1...Sb3
        • 2.Qe7#
      • 1...Sd3
        • 2.Qe7#
      • 1...Sa4
        • 2.Qe7#
      • 1...Se4
        • 2.Qe7#
      • 1...Sa6
        • 2.Qe7#
      • 1...Se6
        • 2.Rd5#
      • 1...Sb7
        • 2.Qe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 8
  • Sets
    • Q(a);N_GUARD,P_PINQ(G)::QAB(G),XQ(a)
    • Q(a);N_GUARD::QAB(G)
    • S(g);N_GUARD::QAR2(G)
    • S(l);N_GUARD::QAB(G)
    • S(l);N_GUARD::QAB(G),XS(l)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • K(h);P-FLIGHT::QAB(G)+R(F),XP(j)
      • Refutation
        • K(h);P-FLIGHT
    • Try
      • R(F);CHECK
      • Refutation
        • P(k);XR(F)
    • Try
      • R(F);
      • Threat
        • DUALS(2)
      • Vars
        • S(l);XR(F)::QAR1(G)
        • Q(a);N_GUARD::QAB(G)
        • P(j);::QAR1(G)
      • Refutation
        • S(l);
    • Try
      • R(F);
      • Threat
        • QAR1(G)
      • Vars
        • S(l);N_GUARD::QAB(G),XS(l)
      • Refutation
        • Q(a);
    • Try
      • R(F);
      • Threat
        • QAR1(G)
      • Vars
        • S(l);OGATE,XR(F)::QAB(G),XS(l)
        • Q(a);N_GUARD,P_PINQ(G)::QAB(G),XQ(a)
        • Q(a);N_GUARD::QAB(G)
      • Refutation
        • P(j);
    • Try
      • R(F);
      • Threat
        • QAR1(G)
      • Vars
        • Q(a);N_GUARD,P_PINQ(G)::QAB(G),XQ(a)
        • Q(a);N_GUARD::QAB(G)
        • S(l);N_GUARD::QAB(G),XS(l)
      • Refutation
        • P(j);
    • Try
      • Q(G);
      • Threat
        • DUALS(3)
      • Vars
        • S(g);::QAR1(G)
        • S(l);N_GUARD::QAB1(G),XS(l)
      • Refutation
        • Q(a);CHECK
    • Try
      • Q(G);CHECK
      • Vars
        • S(l);N_GUARD,P_SPINS(l)::QAB1(G),XS(l)
      • Refutation
        • S(l);XQ(G)
  • Actual
    • R(F);XP(j)
    • Threat
      • S(B)
    • Vars
      • K(h);N_GUARD,S_FLIGHT,XR(F)::B(C)
      • R(i);SBLOCK,XR(F)::QAR1(G)
      • S(l);N_GUARD,SBLOCK,XR(F)::QAB(G)
      • Q(a);N_GUARD::QAB(G)
      • S(g);N_GUARD::QAR2(G)
      • S(g);SBLOCK::R1(F)
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Developed and maintained by Brian Stephenson.
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