MESON Chess Problem Database

Problem Display
PID: 227491 (2n5/2K5/8/QNk5/3R4/8/n7/8 w - - 0 1)

Schonberger, Tibor

Allgemeine Zeitung Chemnitz, 1926

2n5/2K5/8/QNk5/3R4/8/n7/8

#2

4 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sc1
      • 2.Qb4#
    • 1...Sc3
      • 2.Qb4#
    • 1...Sb4
      • 2.Qxb4#
    • 1...Sb6
      • 2.Qxb6#
    • 1...Sd6
      • 2.Qb6#
    • 1...Sa7
      • 2.Qb6#
    • 1...Se7
      • 2.Qb6#
  • Tries
    • 1.Kb7?
      • 1...Sc1
        • 2.Qb4#
      • 1...Sc3
        • 2.Qb4#
      • 1...Sb4
        • 2.Qxb4#
      • 1...Sb6
        • 2.Qxb6#
      • 1...Sa7
        • 2.Qb6#
      • 1...Se7
        • 2.Qb6#
      • 1...Sd6+!
    • 1.Rf4?
      • threat
        • 2.Sa3#
        • 2.Sc3#
        • 2.Sd6#
        • 2.Sa7#
      • 1...Sc3
        • 2.Sxc3#
      • 1...Sd6
        • 2.Sxd6#
      • 1...Sa7
        • 2.Sxa7#
      • 1...Kd5!
    • 1.Rg4?
      • threat
        • 2.Sa3#
        • 2.Sc3#
        • 2.Sd6#
        • 2.Sa7#
      • 1...Sc3
        • 2.Sxc3#
      • 1...Sd6
        • 2.Sxd6#
      • 1...Sa7
        • 2.Sxa7#
      • 1...Kd5!
    • 1.Rh4?
      • threat
        • 2.Sa3#
        • 2.Sc3#
        • 2.Sd6#
        • 2.Sa7#
      • 1...Sc3
        • 2.Sxc3#
      • 1...Sd6
        • 2.Sxd6#
      • 1...Sa7
        • 2.Sxa7#
      • 1...Kd5!
    • 1.Qa3+?
      • 1...Sb4
        • 2.Qxb4#
      • 1...Kxb5!
    • 1.Qa6?
      • threat
        • 2.Qc6#
      • 1...Sb6
        • 2.Qxb6#
      • 1...Sa7
        • 2.Qb6#
      • 1...Se7
        • 2.Qb6#
      • 1...Sb4!
  • Keys
    • 1.Re4!
      • threat
        • 2.Sa3#
        • 2.Sc3#
        • 2.Sd6#
        • 2.Sa7#
      • 1...Kd5
        • 2.Sc3#
        • 2.Sd6#
      • 1...Sc3
        • 2.Sxc3#
      • 1...Sd6
        • 2.Sxd6#
      • 1...Sa7
        • 2.Sxa7#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 4
  • Sets
    • S(a);N_GUARD::QAB1(B)
    • S(a);N_GUARD::QAB1(B),XS(a)
    • S(c);N_GUARD::QAB1(B),XS(c)
    • S(c);N_GUARD::QAB1(B)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Vars
        • S(a);N_GUARD::QAB1(B)
        • S(a);N_GUARD::QAB1(B),XS(a)
        • S(c);N_GUARD::QAB1(B),XS(c)
        • S(c);N_GUARD::QAB1(B)
      • Refutation
        • S(c);CHECK
    • Try
      • R(A);
      • Threat
        • DUALS(4)
      • Vars
        • S(a);::QAR(B)+S(C),XS(a)
        • S(c);::QAR(B)+S(C),XS(c)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • R(A);
      • Threat
        • DUALS(4)
      • Vars
        • S(a);::QAR(B)+S(C),XS(a)
        • S(c);::QAR(B)+S(C),XS(c)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • R(A);
      • Threat
        • DUALS(4)
      • Vars
        • S(a);::QAR(B)+S(C),XS(a)
        • S(c);::QAR(B)+S(C),XS(c)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(B),XS(a)
      • Refutation
        • K(b);P-FLIGHT,XS(C)
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • S(c);N_GUARD::QAB1(B),XS(c)
        • S(c);N_GUARD::QAB1(B)
      • Refutation
        • S(a);
  • Actual
    • R(A);
    • Threat
      • DUALS(4)
    • Vars
      • S(a);::QAR(B)+S(C),XS(a)
      • S(c);::QAR(B)+S(C),XS(c)
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