MESON Chess Problem Database

Problem Display
PID: 241154 (2K2N2/1p5b/4P2n/RQN2k2/p1q1R1pB/2P1P3/4P3/7B w - - 0 1)

Hermanson, Halvar

4th Comm., Sachsische Zeitung, 1976-1977

2K2N2/1p5b/4P2n/RQN2k2/p1q1R1pB/2P1P3/4P3/7B

#2

12 + 7

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Sb3#
    • 1...Qxe2
      • 2.Sd3#
    • 1...Qb3
      • 2.Sxb3#
    • 1...Qd3
      • 2.Sxd3#
    • 1...Qxe6+
      • 2.Scxe6#
    • 1...Qxe4
      • 2.Sxe4#
    • 1...Qxc5+
      • 2.Qxc5#
  • Tries
    • 1.Rxc4?
      • threat
        • 2.Sb3#
        • 2.Sd3#
        • 2.Sxa4#
        • 2.Se4#
        • 2.Sa6#
        • 2.Sxb7#
        • 2.Scd7#
      • 1...Ke5
        • 2.Se4#
        • 2.Sxb7#
      • 1...a3
        • 2.Sb3#
        • 2.Sd3#
        • 2.Sa4#
        • 2.Se4#
        • 2.Sa6#
        • 2.Sxb7#
        • 2.Scd7#
      • 1...g3
        • 2.Sb3#
        • 2.Sd3#
        • 2.Sxa4#
        • 2.Sa6#
        • 2.Sxb7#
        • 2.Scd7#
      • 1...b6
        • 2.Sb3#
        • 2.Sd3#
        • 2.Sxa4#
        • 2.Se4#
        • 2.Sa6#
        • 2.Sb7#
        • 2.Scd7#
      • 1...Sf7!
    • 1.Qxc4?
      • threat
        • 2.Sxb7#
        • 2.Qd5#
      • 1...b5
        • 2.Qd5#
      • 1...b6
        • 2.Qd5#
      • 1...Sf7!
    • 1.Qb1?
      • threat
        • 2.Qf1#
      • 1...Qxe6+
        • 2.Rxe6#
      • 1...Qxc5+
        • 2.Rxc5#
      • 1...Qxe4
        • 2.Sxb7#
        • 2.Qxe4#
      • 1...Qxe2!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Qh5#
      • 1...Qxe6+
        • 2.Qxe6#
      • 1...Qxc5+
        • 2.Rxc5#
      • 1...Sf7
        • 2.Qxf7#
      • 1...Bg6
        • 2.Qxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • Q(b);N_PINS(I)::QAR(H)+S(I)
    • Q(b);N_PINS(I),XP(B)::QAR(H)+S(I)
    • Q(b);N_PINS(I)::QAR(H)+S(I),XQ(b)
    • Q(b);CHECK,N_PINS(I),XP(J)::QAR(H)+S(I),XQ(b)
    • Q(b);N_PINS(I),XR(E)::QAR(H)+S(I),XQ(b)
    • Q(b);CHECK,OGATE,P_SPINQ(b),XS(I)::QAR(H),XQ(b)
  • Tries
    • Try
      • R(E);N_SPINS(I),XQ(b)
      • Threat
        • DUALS(7)
      • Refutation
        • S(e);
    • Try
      • Q(H);N_SPINS(I),XQ(b)
      • Threat
        • DUALS(2)
      • Vars
        • P(f);::QAR2(H)
      • Refutation
        • S(e);
    • Try
      • Q(H);
      • Threat
        • QAR(H)
      • Vars
        • Q(b);CHECK,N_PINS(I),OGATE,XP(J)::QAB(H)+R(E),XQ(b)
        • Q(b);CHECK,OGATE,P_SPINQ(b),XS(I)::R(G),XQ(b)
      • Refutation
        • Q(b);N_PINS(I),XP(B)
  • Actual
    • Q(H);
    • Threat
      • QAR2(H)
    • Vars
      • Q(b);CHECK,N_PINS(I),OGATE,XP(J)::QAB1(H),XQ(b)
      • Q(b);CHECK,OGATE,P_SPINQ(b),XS(I)::R(G),XQ(b)
      • S(e);N_GUARD::QAR2(H),XS(e)
      • B(g);N_GUARD::QAB1(H),XB(g)
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