MESON Chess Problem Database

Problem Display
PID: 18353 (2N5/1pN4K/1rP3Q1/2kP4/1p1p4/1P6/2q5/1bR1nB2 w - - 0 1)

Hermanson, Halvar

3/4 Prize, Ajedrez Argentino, 1955

2N5/1pN4K/1rP3Q1/2kP4/1p1p4/1P6/2q5/1bR1nB2

#2

9 + 8

3105 FIDE Album (1945-1955) 1964
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qc4
      • 2.Rxc4#
    • 1...Sd3
      • 2.Qd6#
    • 1...d3
      • 2.Qg1#
  • Tries
    • 1.Kg7?
      • threat
        • 2.Qd6#
      • 1...d3
        • 2.Qg1#
      • 1...Rxc6!
    • 1.Kg8?
      • threat
        • 2.Qd6#
      • 1...d3
        • 2.Qg1#
      • 1...Rxc6!
    • 1.Kh8?
      • threat
        • 2.Qd6#
      • 1...d3
        • 2.Qg1#
      • 1...Rxc6!
    • 1.Rxc2+?
      • 1...Sxc2
        • 2.Qd6#
      • 1...Bxc2!
    • 1.Qe4?
      • threat
        • 2.Se6#
      • 1...Qc4
        • 2.Rxc4#
      • 1...Sd3
        • 2.Qe7#
      • 1...d3
        • 2.Qe3#
      • 1...Rxc6!
  • Keys
    • 1.Qf5!
      • threat
        • 2.Se6#
      • 1...Rxc6
        • 2.d6#
      • 1...d3
        • 2.Qf2#
      • 1...Qc4
        • 2.Rxc4#
      • 1...Sd3
        • 2.Qf8#

This anticipates 265158(1960), 239999(1982)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(c);OGATE::R1(A),XQ(c)
    • S(b);N_PINQ(F)::QAB1(F)
    • P(e);N_PINQ(F)::QAB(F)
  • Tries
    • Try
      • K(H);N_SPINQ(F),P-FLIGHT
      • Threat
        • QAB1(F)
      • Vars
        • P(e);OGATEB::QAB(F)
      • Refutation
        • R(g);XP(E)
    • Try
      • K(H);N_SPINQ(F),S_FLIGHT
      • Threat
        • QAB1(F)
      • Vars
        • P(e);OGATEB::QAB(F)
      • Refutation
        • R(g);XP(E)
    • Try
      • K(H);N_SPINQ(F),P-FLIGHT
      • Threat
        • QAB1(F)
      • Vars
        • P(e);OGATEB::QAB(F)
      • Refutation
        • R(g);XP(E)
    • Try
      • R(A);CHECK,N_SPINQ(F),XQ(c)
      • Vars
        • S(b);XR(A)::QAB1(F)
      • Refutation
        • B(a);P_PINQ(F),XR(A)
    • Try
      • Q(F);
      • Threat
        • S(G)
      • Vars
        • Q(c);OGATE::R1(A),XQ(c)
        • S(b);N_PINQ(F)::QAB(F)
        • P(e);N_PINQ(F)::QAB(F)
      • Refutation
        • R(g);XP(E)
  • Actual
    • Q(F);
    • Threat
      • S(G)
    • Vars
      • R(g);SBLOCK,XP(E)::QAR(F)+P(D)
      • P(e);N_PINQ(F)::QAB(F)
      • Q(c);OGATE::R1(A),XQ(c)
      • S(b);N_PINQ(F)::QAB(F)
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