MESON Chess Problem Database

Problem Display
PID: 211386 (4R3/3KN1P1/2p1NpP1/R2pk3/2Ppp1p1/2Q5/5q2/8 w - - 0 1)

Jonsson, Nils Gustav Helmer

Land og Folk, 1968

4R3/3KN1P1/2p1NpP1/R2pk3/2Ppp1p1/2Q5/5q2/8

#2

9 + 8

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qe1
      • 2.Qxd4#
    • 1...Qg3
      • 2.Qxd4#
      • 2.Qxg3#
    • 1...Qh4
      • 2.Qxd4#
    • 1...Qf1
      • 2.Qxd4#
    • 1...Qa2
      • 2.Qxd4#
      • 2.Qg3#
    • 1...Qb2
      • 2.Qg3#
    • 1...Qc2
      • 2.Qxd4#
      • 2.Qg3#
    • 1...Qe2
      • 2.Qxd4#
      • 2.Qg3#
    • 1...Qg2
      • 2.Qxd4#
    • 1...Qh2
      • 2.Qxd4#
    • 1...Qf3
      • 2.Qxd4#
    • 1...Qf4
      • 2.Qxd4#
    • 1...Qf5
      • 2.Sxc6#
      • 2.Qxd4#
    • 1...e3
      • 2.Qxd4#
  • Tries
    • 1.Sxd5?
      • threat
        • 2.Sxd4#
      • 1...Kf5
        • 2.Se7#
      • 1...cxd5
        • 2.Rxd5#
      • 1...Qf5
        • 2.Qxd4#
      • 1...dxc3!
    • 1.Qg3+?
      • 1...Qf4
        • 2.Qxf4#
      • 1...Qxg3!
  • Keys
    • 1.Sxd4!
      • threat
        • 2.Sxd5#
      • 1...Qf5+
        • 2.Se6#
      • 1...Kf4
        • 2.Se6#
      • 1...Qxd4
        • 2.Qg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 9
  • Sets
    • Q(a);N_GUARD::QAB1(A),XP(b)
    • Q(a);N_GUARD::QAB(A)
    • P(c);S_CUTQ(a)::QAB1(A),XP(b)
  • Tries
    • Try
      • S(G);XP(e)
      • Threat
        • R(I)+S(D),XP(b)
      • Vars
        • K(f);N_SPINP(b),P-FLIGHT::R(C)+S(G),DCHECK
        • P(g);OGATE,XS(G)::R1(C),XP(g)
        • Q(a);N_GUARD,P_PINS(D),SBLOCK::QAB1(A),XP(b)
      • Refutation
        • P(b);N_SPINP(b),XQ(A)
    • Try
      • Q(A);CHECK,N_PINP(b),P_PINP(e)
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAB1(A),XQ(a)
      • Refutation
        • Q(a);XQ(A)
  • Actual
    • S(D);P_PINP(e),XP(b)
    • Threat
      • R(I)+S(G),XP(e)
    • Vars
      • Q(a);CHECK,N_GUARD::QAB(A)+S(D)
      • K(f);N_SPINP(e),S_FLIGHT::S(D)
      • Q(a);N_GUARD,P_SPINQ(a),SBLOCK,XS(D)::QAB(A)
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Developed and maintained by Brian Stephenson.
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