MESON Chess Problem Database

Problem Display
PID: 238140 (8/7P/8/5R2/2pkp3/3P3r/N4P1B/bK1Q4 w - - 0 1)

Hermanson, Halvar

Mat, 1977

8/7P/8/5R2/2pkp3/3P3r/N4P1B/bK1Q4

#2

8 + 5

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd3
      • 2.h8Q#
      • 2.h8B#
    • 1...Re3
      • 2.h8Q#
      • 2.h8B#
    • 1...Rf3
      • 2.h8Q#
      • 2.h8B#
    • 1...cxd3
      • 2.Qa4#
    • 1...exd3
      • 2.Qg4#
  • Tries
    • 1.Bc7?
      • threat
        • 2.Bb6#
      • 1...cxd3
        • 2.Qa4#
      • 1...exd3
        • 2.Qg4#
      • 1...Rh6!
    • 1.Qa4?
      • threat
        • 2.Qd7#
        • 2.Qxc4#
      • 1...Kxd3
        • 2.Qd1#
      • 1...Rxd3
        • 2.Qd7#
        • 2.Qa7#
        • 2.h8Q#
        • 2.h8B#
      • 1...Rxh7
        • 2.Qxc4#
      • 1...Rh6
        • 2.Qxc4#
      • 1...exd3!
    • 1.Qc1?
      • threat
        • 2.Qxc4#
      • 1...Kxd3
        • 2.Qd1#
      • 1...Rxd3
        • 2.h8Q#
        • 2.h8B#
      • 1...cxd3
        • 2.Qc5#
      • 1...exd3
        • 2.Qf4#
      • 1...Bc3
        • 2.Qxc3#
      • 1...c3!
    • 1.Qe1?
      • threat
        • 2.Qxe4#
      • 1...Kxd3
        • 2.Qd1#
      • 1...Rxd3
        • 2.h8Q#
        • 2.h8B#
      • 1...cxd3
        • 2.Qb4#
      • 1...exd3
        • 2.Qe5#
      • 1...Re3
        • 2.Qxe3#
      • 1...Rh4
        • 2.Qe3#
      • 1...e3!
    • 1.dxc4+?
      • 1...Kxc4
        • 2.Qd5#
      • 1...Rd3!
    • 1.dxe4+?
      • 1...Kxe4
        • 2.Qd5#
      • 1...Rd3!
  • Keys
    • 1.Bd6!
      • threat
        • 2.Bc5#
      • 1...cxd3
        • 2.Qa4#
      • 1...exd3
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • R(b);N_GUARD,P_SPINR(b),XP(F)::P=Q
    • R(b);N_GUARD::P=Q
    • P(c);OGATEB,P_SPINP(c),SBLOCK,XP(F)::QAR(B)
    • P(e);OGATEB,P_SPINP(e),SBLOCK,XP(F)::QAR(B)
  • Tries
    • Try
      • B(E);
      • Threat
        • B(E)
      • Vars
        • P(c);OGATEB,P_SPINP(c),SBLOCK,XP(F)::QAR(B)
        • P(e);OGATEB,P_SPINP(e),SBLOCK,XP(F)::QAR(B)
      • Refutation
        • R(b);
    • Try
      • Q(B);P_PINP(c)
      • Threat
        • DUALS(2)
      • Vars
        • K(d);N_SPINP(c),OGATEB,P-FLIGHT,XP(F)::QAR2(B)
        • R(b);XP(H)::QAR1(B),XP(c)
        • R(b);::QAR1(B),XP(c)
      • Refutation
        • P(e);XP(F)
    • Try
      • Q(B);
      • Threat
        • QAR1(B),XP(c)
      • Vars
        • K(d);OGATEB,P-FLIGHT,XP(F)::QAR2(B)
        • R(b);N_GUARD,SBLOCK,XP(F)::P=Q
        • P(c);OGATE,SBLOCK,XP(F)::QAB1(B)
        • P(e);OGATEB,SBLOCK,XP(F)::QAR2(B)
        • B(a);N_GUARD::QAB1(B),XB(a)
      • Refutation
        • P(c);
    • Try
      • Q(B);
      • Threat
        • QAR1(B),XP(e)
      • Vars
        • K(d);OGATEB,P-FLIGHT,XP(F)::QAR2(B)
        • R(b);N_GUARD,SBLOCK,XP(F)::P=Q
        • P(c);OGATEB,SBLOCK,XP(F)::QAR2(B)
        • P(e);OGATE,SBLOCK,XP(F)::QAB1(B)
        • R(b);N_GUARD::QAB1(B),XR(b)
        • R(b);N_GUARD::QAB1(B)
      • Refutation
        • P(e);
    • Try
      • P(F);CHECK,XP(c)
      • Vars
        • K(d);OGATE,P-FLIGHT,XP(F)::QAB1(B)
      • Refutation
        • R(b);P_SPINR(b)
    • Try
      • P(F);CHECK,XP(e)
      • Vars
        • K(d);OGATE,P-FLIGHT,XP(F)::QAB1(B)
      • Refutation
        • R(b);P_SPINR(b)
  • Actual
    • B(E);
    • Threat
      • B(E)
    • Vars
      • P(c);OGATEB,P_SPINP(c),SBLOCK,XP(F)::QAR(B)
      • P(e);OGATEB,P_SPINP(e),SBLOCK,XP(F)::QAR(B)
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