MESON Chess Problem Database

Problem Display
PID: 260907 (8/8/K6n/7n/5p1k/2Q3Rp/4B1pp/8 w - - 0 1)

Nagler, Alois

Neue Zurcher Zeitung, 1940

8/8/K6n/7n/5p1k/2Q3Rp/4B1pp/8

#2

4 + 7

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sxg3
      • 2.Qf6#
    • 1...Sg4
      • 2.Rxg4#
    • 1...Sf5
      • 2.Rg4#
    • 1...Sf7
      • 2.Rg4#
    • 1...Sg8
      • 2.Rg4#
  • Tries
    • 1.Qe5?
      • threat
        • 2.Qg5#
      • 1...Sxg3
        • 2.Qf6#
        • 2.Qe7#
      • 1...fxg3
        • 2.Qxh5#
      • 1...Sg4
        • 2.Rxg4#
      • 1...Sf5
        • 2.Rg4#
      • 1...Sf7
        • 2.Rg4#
      • 1...Kxg3!
    • 1.Qc5?
      • threat
        • 2.Qg5#
      • 1...Sxg3
        • 2.Qe7#
      • 1...fxg3
        • 2.Qxh5#
      • 1...Sg4
        • 2.Rxg4#
      • 1...Sf5
        • 2.Rg4#
      • 1...Sf7
        • 2.Rg4#
      • 1...Kxg3!
  • Keys
    • 1.Qa5!
      • threat
        • 2.Qg5#
      • 1...Kxg3
        • 2.Qe1#
      • 1...Sxg3
        • 2.Qd8#
      • 1...fxg3
        • 2.Qxh5#
      • 1...Sg4
        • 2.Rxg4#
      • 1...Sf5
        • 2.Rg4#
      • 1...Sf7
        • 2.Rg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(f);N_GUARD,SBLOCK,XR(C)::QAB(B)
    • S(g);N_GUARD::R1(C),XS(g)
    • S(g);N_GUARD::R1(C)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • P(d);SBLOCK,XR(C)::QAR1(B),XS(f)
        • S(g);N_GUARD::R1(C),XS(g)
        • S(g);N_GUARD::R1(C)
      • Refutation
        • K(e);P_SPINP(d),S_FLIGHT,XR(C)
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • S(f);N_GUARD,SBLOCK,XR(C)::QAB(B)
        • P(d);SBLOCK,XR(C)::QAR1(B),XS(f)
        • S(g);N_GUARD::R1(C),XS(g)
        • S(g);N_GUARD::R1(C)
      • Refutation
        • K(e);S_FLIGHT,XR(C)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • K(e);OGATEB,S_FLIGHT,XR(C)::QAB(B)
      • S(f);N_GUARD,SBLOCK,XR(C)::QAB(B)
      • P(d);SBLOCK,XR(C)::QAR1(B),XS(f)
      • S(g);N_GUARD::R1(C),XS(g)
      • S(g);N_GUARD::R1(C)
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