MESON Chess Problem Database

Problem Display
PID: 11112 (KR4B1/4p3/pRp5/2pN4/NPk4q/r2p2n1/8/1Qn3Bb w - - 0 1)

Persson, Hol Holger

Schackvarlden, 1936

KR4B1/4p3/pRp5/2pN4/NPk4q/r2p2n1/8/1Qn3Bb

#2

9 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Se3#
    • 1...Sb3
      • 2.Sb2#
    • 1...Se4
      • 2.Sxe7#
    • 1...cxb4
      • 2.Rxb4#
      • 2.Rxc6#
      • 2.Qxb4#
  • Tries
    • 1.Rxc6?
      • threat
        • 2.Rxc5#
      • 1...Qd4
        • 2.Se3#
      • 1...Sb3
        • 2.Sb2#
      • 1...Se4
        • 2.Sxe7#
      • 1...Bxd5!
    • 1.Qc2+?
      • 1...Rc3
        • 2.Sb2#
        • 2.Qxc3#
      • 1...dxc2!
    • 1.Qxc1+?
      • 1...Rc3
        • 2.Qxc3#
      • 1...Kb3!
  • Keys
    • 1.Rb5!
      • threat
        • 2.Rxc5#
      • 1...cxb4
        • 2.Rxb4#
        • 2.Rc5#
        • 2.Qxb4#
      • 1...axb5
        • 2.Sb6#
      • 1...cxb5
        • 2.Sb6#
      • 1...Qd4
        • 2.Se3#
      • 1...Sb3
        • 2.Sb2#
      • 1...Se4
        • 2.Sxe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(g);SBLOCK::B(I)+S(E),DCHECK
    • S(a);SBLOCK::S(C)
    • S(e);S_CUTB(b)::B(I)+S(E),XP(k)
  • Tries
    • Try
      • R(F);P_PINP(h),XP(j)
      • Threat
        • R1(F),XP(h)
      • Vars
        • Q(g);SBLOCK::B(I)+S(E),DCHECK
        • S(a);SBLOCK::S(C)
        • S(e);S_CUTB(b)::B(I)+S(E),XP(k)
      • Refutation
        • B(b);P_PINR(F),P_SPINB(b),XS(E)
    • Try
      • Q(A);CHECK
      • Refutation
        • P(d);XQ(A)
    • Try
      • Q(A);CHECK,XS(a)
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::QAR1(A),XR(c)
      • Refutation
        • K(f);S_FLIGHT
  • Actual
    • R(F);
    • Threat
      • R1(F),XP(h)
    • Vars
      • P(i);P_PINS(C),SBLOCK,XR(F)::B(I)+S(E),DCHECK
      • P(j);P_PINS(E),SBLOCK,XR(F)::S(C)
      • Q(g);SBLOCK::B(I)+S(E),DCHECK
      • S(a);SBLOCK::S(C)
      • S(e);S_CUTB(b)::B(I)+S(E),XP(k)
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