MESON Chess Problem Database

Problem Display
PID: 238090 (B7/1N6/5q2/2pR1P2/4k3/2r2r1P/2Np2QB/3K4 w - - 0 1)

Hermanson, Halvar

Arbejder-Skak, 1954

B7/1N6/5q2/2pR1P2/4k3/2r2r1P/2Np2QB/3K4

#2

9 + 6

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd5
      • 2.Sd6#
    • 1...Qh4
      • 2.Sd6#
    • 1...Qg5
      • 2.Sd6#
    • 1...Qg7
      • 2.Sd6#
    • 1...Qh8
      • 2.Sd6#
    • 1...Qxf5
      • 2.Sd6#
    • 1...Qd6
      • 2.Sxd6#
    • 1...Qf7
      • 2.Sd6#
    • 1...Ra3
      • 2.Sxc5#
    • 1...Rb3
      • 2.Sxc5#
    • 1...Rd3
      • 2.Sxc5#
    • 1...Re3
      • 2.Sxc5#
    • 1...c4
      • 2.Sc5#
  • Tries
    • 1.Rxd2?
      • threat
        • 2.Sd6#
      • 1...Kxf5
        • 2.Qg4#
      • 1...Qd6
        • 2.Sxd6#
      • 1...Rxc2!
    • 1.Re5+?
      • 1...Kd3
        • 2.Qe2#
      • 1...Qxe5!
    • 1.Qxf3+?
      • 1...Rxf3
        • 2.Sxc5#
      • 1...Kxf3!
    • 1.Qe2+?
      • 1...Kxd5
        • 2.Sd6#
      • 1...Rce3
        • 2.Sxc5#
      • 1...Rfe3!
    • 1.Qg4+?
      • 1...Kxd5
        • 2.Sd6#
      • 1...Rf4!
  • Keys
    • 1.Rd3!
      • threat
        • 2.Qxf3#
      • 1...Kxd3
        • 2.Qe2#
      • 1...Kxf5
        • 2.Qg4#
      • 1...Qxf5
        • 2.Sxc5#
      • 1...Rxd3
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 11
  • Sets
    • K(d);S_FLIGHT,XR(F)::B(I)+S(H)
    • Q(f);N_GUARD::S(H)
    • Q(f);N_GUARD,XP(G)::S(H)
    • Q(f);N_GUARD::S(H),XQ(f)
    • R(b);N_GUARD::S(H),XP(e)
    • P(e);S_CUTR(b)::S(H)
  • Tries
    • Try
      • R(F);XP(a)
      • Threat
        • B(I)+S(H),DCHECK
      • Vars
        • K(d);N_SPINR(c),S_FLIGHT,XP(G)::QAB1(C)
        • Q(f);P_PINR(F)::B(I)+S(H),DCHECK,XQ(f)
      • Refutation
        • R(b);XS(B)
    • Try
      • R(F);CHECK
      • Vars
        • K(d);N_SPINR(c),S_FLIGHT::QAB1(C)
      • Refutation
        • Q(f);XR(F)
    • Try
      • Q(C);CHECK,XR(c)
      • Vars
        • R(b);SBLOCK,XQ(C)::S(H),XP(e)
      • Refutation
        • K(d);S_FLIGHT,XQ(C)
    • Try
      • Q(C);CHECK,N_PINR(c)
      • Vars
        • K(d);S_FLIGHT,XR(F)::B(I)+S(H)
        • R(b);P_SPINR(b)::S(H),XP(e)
      • Refutation
        • R(c);P_SPINR(c)
    • Try
      • Q(C);CHECK,N_PINR(c)
      • Vars
        • K(d);S_FLIGHT,XR(F)::B(I)+S(H)
      • Refutation
        • R(c);P_SPINR(c)
  • Actual
    • R(F);
    • Threat
      • QAB1(C),XR(c)
    • Vars
      • K(d);N_SPINR(c),S_FLIGHT,XR(F)::QAB1(C)
      • K(d);N_SPINR(c),S_FLIGHT,XP(G)::QAB1(C)
      • Q(f);SBLOCK,XP(G)::B(I)+S(H),DCHECK,XP(e)
      • R(b);SBLOCK,XR(F)::B(I)+S(H),DCHECK
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