MESON Chess Problem Database

Problem Display
PID: 189722 (2b5/1pp2R1n/N5Q1/1PPk4/4pP2/2K1p1pq/8/8 w - - 0 1)

Palkoska, Emil

Deutsche Schachzeitung, 1912

2b5/1pp2R1n/N5Q1/1PPk4/4pP2/2K1p1pq/8/8

#2

7 + 9

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...bxa6
      • 2.Qc6#
    • 1...b6
      • 2.Qc6#
    • 1...c6
      • 2.Qd6#
  • Tries
    • 1.Rxc7?
      • threat
        • 2.Sb4#
        • 2.Qd6#
      • 1...bxa6
        • 2.Qc6#
        • 2.Qd6#
      • 1...Qe6
        • 2.Sb4#
      • 1...Qd7
        • 2.Sb4#
      • 1...Qh6
        • 2.Sb4#
      • 1...Be6
        • 2.Sb4#
      • 1...Sf6!
    • 1.Qb6?
      • threat
        • 2.Sb4#
        • 2.Sxc7#
      • 1...bxa6
        • 2.Qc6#
      • 1...c6
        • 2.Sc7#
      • 1...Qd7
        • 2.Sb4#
      • 1...cxb6!
  • Keys
    • 1.Qg8!
      • threat
        • 2.Rf5#
        • 2.Rd7#
      • 1...Ke6
        • 2.Sxc7#
      • 1...bxa6
        • 2.Rf5#
      • 1...Qf5
        • 2.Rxf5#
        • 2.Rd7#
      • 1...Qe6
        • 2.Rf5#
      • 1...Qd7
        • 2.Rf5#
        • 2.Rxd7#
      • 1...Bf5
        • 2.Rxf5#
        • 2.Rd7#
      • 1...Be6
        • 2.Rd7#
      • 1...Bd7
        • 2.Rf5#
        • 2.Rxd7#
      • 1...Sf6
        • 2.Rd7#

There are these versions: 189853

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • P(f);N_GUARD,XS(E)::QAB1(F)
    • P(f);N_GUARD::QAB1(F)
    • P(g);N_GUARD::QAR1(F)
  • Tries
    • Try
      • R(G);XP(g)
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);::S(E)
        • B(i);::S(E)
      • Refutation
        • S(h);
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • P(f);N_GUARD,XS(E)::QAB1(F)
        • P(g);::S(E)
        • Q(c);::S(E)
      • Refutation
        • P(g);XQ(F)
  • Actual
    • Q(F);
    • Threat
      • DUALS(2)
    • Vars
      • K(e);S_FLIGHT::S(E),XP(g)
      • P(f);XS(E)::QAB(F)+R(G),DCHECK
      • Q(c);::R(G)
      • B(i);::R(G)
      • S(h);::QAB(F)+R(G),DCHECK
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