MESON Chess Problem Database

Problem Display
PID: 273927 (4Qrr1/1p3pp1/1R6/R5Pk/6pN/8/K1p3Np/2B5 w - - 0 1)

Paslack, Rainer

Die Schwalbe, 2023

4Qrr1/1p3pp1/1R6/R5Pk/6pN/8/K1p3Np/2B5

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...g3
      • 2.Qe2#
  • Tries
    • 1.Sf5?
      • threat
        • 2.Sg3#
      • 1...g3
        • 2.Qe2#
      • 1...h1S!
    • 1.Rf5?
      • threat
        • 2.g6#
      • 1...g3
        • 2.Qe2#
      • 1...g6!
    • 1.Qxf7+?
      • 1...g6
        • 2.Qh7#
      • 1...Rxf7!
    • 1.Qe1?
      • threat
        • 2.Sf4#
      • 1...g3
        • 2.Qe2#
      • 1...f5!
  • Keys
    • 1.Sg6!
      • threat
        • 2.S2f4#
        • 2.S6f4#
      • 1...fxg6
        • 2.Qxg6#
      • 1...g3
        • 2.Qe2#
      • 1...f5
        • 2.gxf5 ep#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(c);OGATEB::QAB(H)
  • Tries
    • Try
      • S(D);
      • Threat
        • S(D)
      • Vars
        • P(c);OGATEB::QAB(H)
      • Refutation
        • P(b);
    • Try
      • R(E);
      • Threat
        • R(E)+P(F)
      • Vars
        • P(c);OGATEB::QAB(H)
      • Refutation
        • P(g);N_SPINP(f)
    • Try
      • Q(H);CHECK,XP(f)
      • Vars
        • P(g);OGATE,P_SPINP(g)::QAR2(H)
      • Refutation
        • R(h);XQ(H)
    • Try
      • Q(H);N_PINP(f)
      • Threat
        • S(C)
      • Vars
        • P(c);OGATEB::QAB(H)
      • Refutation
        • P(f);
  • Actual
    • S(D);N_PINP(f)
    • Threat
      • DUALS(2)
    • Vars
      • P(f);OGATE,P_SPINP(f),XS(D)::QAB1(H),XP(f)
      • P(c);OGATEB::QAB(H)
      • P(f);OGATE::R(E)+P(F),XP(f),EP
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