MESON Chess Problem Database

Problem Display
PID: 189783 (3Q3K/5P1n/B1p1P1N1/P1k5/1p1N4/1p6/1b1R4/5r1b w - - 0 1)

Jespersen, Karl Lorenz Jesper

HM., Budapesti Sakkor, 1912

3Q3K/5P1n/B1p1P1N1/P1k5/1p1N4/1p6/1b1R4/5r1b

#2

9 + 8

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rf6
      • 2.Sxb3#
    • 1...Bd5
      • 2.Qe7#
    • 1...Bc1
      • 2.Sxb3#
    • 1...Ba3
      • 2.Sxb3#
    • 1...Bxd4+
      • 2.Qxd4#
    • 1...Sf6
      • 2.Sxb3#
      • 2.f8Q#
      • 2.f8B#
  • Tries
    • 1.Sf4?
      • threat
        • 2.Sd3#
        • 2.Qe7#
      • 1...Bxd4+
        • 2.Qxd4#
      • 1...Rf3
        • 2.Qe7#
      • 1...Be4
        • 2.Qe7#
      • 1...Bd5
        • 2.Qe7#
      • 1...Rxf4!
    • 1.Se5?
      • threat
        • 2.Sxb3#
        • 2.Sd3#
      • 1...Bxd4
        • 2.Qxd4#
      • 1...Be4
        • 2.Sxb3#
      • 1...Bd5
        • 2.Qe7#
      • 1...Rf3!
    • 1.Qb6+?
      • 1...Kd5
        • 2.Qxc6#
      • 1...Kd6!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Sxb3#
      • 1...Kd5
        • 2.Qe5#
      • 1...Kd6
        • 2.Qe5#
      • 1...Bxd4
        • 2.Qxd4#
      • 1...Rf3
        • 2.Qe5#
      • 1...Bd5
        • 2.Qe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • R(a);N_PINS(B)::S(B),XP(d)
    • B(b);SBLOCK::QAB(H)
    • B(c);N_PINS(B)::S(B),XP(d)
    • B(c);CHECK,OGATE,XS(B)::QAB1(H),XB(c)
  • Tries
    • Try
      • S(F);
      • Threat
        • DUALS(2)
      • Vars
        • B(c);CHECK,OGATE,XS(B)::QAB1(H),XB(c)
        • R(a);::QAB(H)
        • B(b);::QAB(H)
      • Refutation
        • R(a);XS(F)
    • Try
      • S(F);N_SPINS(B)
      • Threat
        • DUALS(2)
      • Vars
        • B(c);OGATE,P_PINS(F),XS(B)::QAB1(H),XB(c)
        • B(b);::S(B),XP(d)
        • B(b);SBLOCK::QAB(H)
      • Refutation
        • R(a);
    • Try
      • Q(H);CHECK
      • Vars
        • K(f);P-FLIGHT::QAB1(H),XP(g)
      • Refutation
        • K(f);P_SPINP(g),S_FLIGHT
  • Actual
    • Q(H);N_SPINS(B)
    • Threat
      • S(B),XP(d)
    • Vars
      • K(f);P-FLIGHT::QAR1(H)
      • K(f);S_FLIGHT::QAB1(H)
      • B(c);OGATE,P_PINQ(H),XS(B)::QAB1(H),XB(c)
      • R(a);S_CUTB(b)::QAR2(H)
      • B(b);SBLOCK::QAB(H)
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