MESON Chess Problem Database

Problem Display
PID: 261989 (n1n1K3/P1P1R3/B1kP4/RN2pN2/1Pp4b/2P1B3/6b1/3Q4 w - - 0 1)

Hjelle, David

1st HM., Problemnoter, 1953

n1n1K3/P1P1R3/B1kP4/RN2pN2/1Pp4b/2P1B3/6b1/3Q4

#2

13 + 7

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sxc7+
      • 2.Rxc7#
    • 1...Sxd6+
      • 2.Qxd6#
    • 1...Sxa7
      • 2.Sxa7#
  • Tries
    • 1.Sa3?
      • threat
        • 2.Qa4#
        • 2.b5#
      • 1...Sxc7+
        • 2.Rxc7#
      • 1...Sxd6+
        • 2.Qxd6#
      • 1...Sab6
        • 2.Rc5#
        • 2.b5#
      • 1...Scb6
        • 2.Rc5#
        • 2.b5#
      • 1...Sxa7!
    • 1.Qd4?
      • threat
        • 2.Qc5#
        • 2.Qxc4#
      • 1...Sxc7+
        • 2.Rxc7#
      • 1...Sxd6+
        • 2.Qxd6#
      • 1...Bf1
        • 2.Qc5#
        • 2.Qe4#
      • 1...Bd5
        • 2.Qc5#
      • 1...Sab6
        • 2.Qc5#
      • 1...Scb6
        • 2.Qc5#
      • 1...exd4!
    • 1.Qd5+?
      • 1...Kxd5
        • 2.Bb7#
      • 1...Bxd5!
  • Keys
    • 1.Qa4!
      • threat
        • 2.Sa3#
      • 1...Sxc7+
        • 2.Sxc7#
      • 1...Sxd6+
        • 2.Sbxd6#
      • 1...Kd5
        • 2.Bb7#
      • 1...Sxa7
        • 2.Sxa7#
      • 1...Sab6
        • 2.Sbd4#
      • 1...Scb6
        • 2.Sbd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(f);CHECK,OGATE,XP(K)::R1(L),XS(f)
    • S(g);CHECK,OGATE,XP(I)::QAR1(A),XS(g)
    • S(g);XP(J)::S(F),XS(g)
  • Tries
    • Try
      • S(F);
      • Threat
        • DUALS(2)
      • Vars
        • S(f);CHECK,OGATE,XP(K)::R1(L),XS(f)
        • S(g);CHECK,OGATE,XP(I)::QAR1(A),XS(g)
      • Refutation
        • S(g);XP(J)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(f);CHECK,OGATE,XP(K)::R1(L),XS(f)
        • S(g);CHECK,OGATE,XP(I)::QAR1(A),XS(g)
        • B(a);::QAR1(A)
        • S(f);::QAR1(A)
        • S(g);::QAR1(A)
      • Refutation
        • P(d);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(e);S_FLIGHT,XQ(A)::B(H)
      • Refutation
        • B(a);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)+S(F)
    • Vars
      • S(f);CHECK,XP(K)::QAB(A)+S(F),XS(f)
      • S(g);CHECK,XP(I)::QAB(A)+S(F),XS(g)
      • K(e);N_GUARD,S_FLIGHT::B(H)
      • S(g);XP(J)::QAB(A)+S(F),DCHECK,XS(g)
      • S(f);SBLOCK::QAB(A)+S(F),DCHECK
      • S(g);SBLOCK::QAB(A)+S(F),DCHECK
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