MESON Chess Problem Database

Problem Display
PID: 266732 (8/8/5R2/1pk3K1/Pppp1N1Q/8/8/8 w - - 0 1)

Steiner, Paul

The Problemist, 1998

8/8/5R2/1pk3K1/Pppp1N1Q/8/8/8

#2

5 + 5

5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...d3
      • 2.Qf2#
  • Tries
    • 1.Sd3+?
      • 1...Kd5
        • 2.Qh1#
      • 1...cxd3!
    • 1.Qe1?
      • threat
        • 2.Qe5#
        • 2.Qe7#
      • 1...bxa4
        • 2.Qe5#
      • 1...d3
        • 2.Qf2#
        • 2.Qg1#
        • 2.Qe3#
        • 2.Qe5#
      • 1...b3
        • 2.Qe7#
      • 1...c3!
    • 1.Qh1?
      • threat
        • 2.Rc6#
        • 2.Qd5#
        • 2.Qc6#
      • 1...bxa4
        • 2.Qd5#
        • 2.Qc6#
      • 1...d3
        • 2.Qd5#
        • 2.Qg1#
      • 1...b3!
    • 1.Qh3?
      • threat
        • 2.Qf5#
        • 2.Qc8#
      • 1...bxa4
        • 2.Qf5#
      • 1...c3
        • 2.Qc8#
      • 1...d3
        • 2.Qe3#
      • 1...b3!
    • 1.Qg4?
      • threat
        • 2.Qf5#
        • 2.Qc8#
      • 1...bxa4
        • 2.Qf5#
      • 1...c3
        • 2.Qc8#
      • 1...d3
        • 2.Qg1#
      • 1...b3!
    • 1.Qh6?
      • threat
        • 2.Rf5#
        • 2.Rc6#
        • 2.Qf8#
      • 1...bxa4
        • 2.Rf5#
      • 1...b3
        • 2.Qf8#
      • 1...c3
        • 2.Rc6#
      • 1...d3!
  • Keys
    • 1.Qh7!
      • threat
        • 2.Qf5#
        • 2.Qa7#
        • 2.Qc7#
        • 2.Qe7#
      • 1...bxa4
        • 2.Qf5#
      • 1...b3
        • 2.Qe7#
      • 1...c3
        • 2.Qc7#
      • 1...d3
        • 2.Qa7#

This anticipates 251788(2021)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(c);OGATEB::QAB(C)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • K(e);P-FLIGHT,S_CUTP(b)::QAB(C)
      • Refutation
        • P(b);XS(B)
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • P(d);XP(A)::QAR2(C)
        • P(a);::QAB(C)
      • Refutation
        • P(b);
    • Try
      • Q(C);
      • Threat
        • DUALS(3)
      • Refutation
        • P(a);
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • P(d);XP(A)::QAR(C)
        • P(b);::QAR(C)
        • P(c);OGATEB::QAB(C)
      • Refutation
        • P(a);
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • P(d);XP(A)::QAR(C)
        • P(b);::QAR(C)
        • P(c);OGATEB::QAB(C)
      • Refutation
        • P(a);
    • Try
      • Q(C);
      • Threat
        • DUALS(3)
      • Vars
        • P(d);XP(A)::R(E)
        • P(a);::QAB(C)
        • P(b);::R1(E)
      • Refutation
        • P(c);
  • Actual
    • Q(C);
    • Threat
      • DUALS(4)
    • Vars
      • P(d);XP(A)::QAR(C)
      • P(a);::QAB(C)
      • P(b);::QAR2(C)
      • P(c);::QAB(C)
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