MESON Chess Problem Database

Problem Display
PID: 238156 (8/3pp3/2P1Pp2/R4P2/1Q1pk3/4p1K1/1N6/1b6 w - - 0 1)

Hermanson, Halvar

2nd HM., Deutsche Schachzeitung, 1957

8/3pp3/2P1Pp2/R4P2/1Q1pk3/4p1K1/1N6/1b6

#2

7 + 7

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Qe1?
      • threat
        • 2.Qh1#
      • 1...e2
        • 2.Qxe2#
      • 1...d3
        • 2.Qb4#
      • 1...d5!
    • 1.Qd6?
      • threat
        • 2.Qf4#
        • 2.Qd5#
      • 1...dxc6
        • 2.Qf4#
        • 2.Qxc6#
      • 1...dxe6
        • 2.Qf4#
        • 2.Qxe6#
      • 1...e2
        • 2.Qf4#
      • 1...Ba2
        • 2.Qf4#
      • 1...exd6!
    • 1.Qb3?
      • threat
        • 2.Qd5#
      • 1...dxe6
        • 2.Qxe6#
      • 1...d5
        • 2.Qxd5#
      • 1...Ba2
        • 2.Qd3#
      • 1...e2
        • 2.Qf3#
      • 1...dxc6!
    • 1.Qb5?
      • threat
        • 2.Qd5#
      • 1...dxc6
        • 2.Qxc6#
      • 1...e2
        • 2.Qxe2#
      • 1...d5
        • 2.Qxd5#
      • 1...Ba2
        • 2.Qd3#
      • 1...dxe6!
  • Keys
    • 1.Qc4!
      • threat
        • 2.Qd5#
      • 1...dxc6
        • 2.Qxc6#
      • 1...dxe6
        • 2.Qxe6#
      • 1...e2
        • 2.Qxe2#
      • 1...d5
        • 2.Qxd5#
      • 1...Ba2
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(C);N_PINP(c),P_PINP(b)
      • Threat
        • QAB(C)
      • Vars
        • P(b);OGATEB::QAR2(C),XP(b)
        • P(c);OGATEB::QAR(C)
      • Refutation
        • P(f);
    • Try
      • Q(C);N_PINP(c)
      • Threat
        • DUALS(2)
      • Vars
        • P(b);::QAR1(C)
        • B(a);::QAR1(C)
      • Refutation
        • P(g);XQ(C)
    • Try
      • Q(C);N_PINP(c)
      • Threat
        • QAB1(C)
      • Vars
        • P(f);OGATE,XP(G)::QAR2(C),XP(f)
        • P(f);::QAB1(C),XP(f)
        • B(a);N_GUARD::QAB1(C)
        • P(b);OGATE::QAB1(C)
      • Refutation
        • P(f);XP(F)
    • Try
      • Q(C);N_PINP(c)
      • Threat
        • QAB1(C)
      • Vars
        • P(f);OGATE,XP(F)::QAB(C),XP(f)
        • P(b);OGATEB::QAR2(C),XP(b)
        • P(f);::QAB1(C),XP(f)
        • B(a);N_GUARD::QAB1(C)
      • Refutation
        • P(f);XP(G)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C)
    • Vars
      • P(f);OGATE,XP(F)::QAB(C),XP(f)
      • P(f);OGATE,XP(G)::QAR2(C),XP(f)
      • P(b);OGATEB::QAR2(C),XP(b)
      • P(f);::QAB1(C),XP(f)
      • B(a);N_GUARD::QAB1(C)
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