MESON Chess Problem Database

Problem Display
PID: 120658 (1Nb5/1n2Bp2/8/3pk3/3R4/6N1/6nK/3Q4 w - - 0 1)

Lissner, Morris

Checkmate, 1902

1Nb5/1n2Bp2/8/3pk3/3R4/6N1/6nK/3Q4

#2

6 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Be6
      • 2.Sc6#
  • Tries
    • 1.Rxd5+?
      • 1...Kf4
        • 2.Bg5#
      • 1...Ke6!
    • 1.Qe2+?
      • 1...Se3
        • 2.Qxe3#
      • 1...Kxd4!
    • 1.Qf3?
      • threat
        • 2.Qxd5#
        • 2.Qf6#
      • 1...Ke6
        • 2.Qf6#
      • 1...Bf5
        • 2.Qxd5#
      • 1...Be6
        • 2.Sc6#
        • 2.Qf6#
      • 1...Se3
        • 2.Qxe3#
        • 2.Qf6#
      • 1...Sf4
        • 2.Qe3#
      • 1...f5
        • 2.Qxd5#
      • 1...f6
        • 2.Qxd5#
        • 2.Qxf6#
      • 1...Kxd4!
  • Keys
    • 1.Qb3!
      • threat
        • 2.Qxd5#
      • 1...Kxd4
        • 2.Sc6#
      • 1...Ke6
        • 2.Re4#
      • 1...Be6
        • 2.Sc6#
      • 1...Se3
        • 2.Qxe3#
      • 1...Sf4
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • B(f);SBLOCK::S(F)
  • Tries
    • Try
      • R(D);CHECK,XP(b)
      • Vars
        • K(c);S_FLIGHT::B(E)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAR2(A),XS(a)
      • Refutation
        • K(c);S_FLIGHT,XR(D)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • K(c);P-FLIGHT::QAR1(A)
        • B(f);::QAR1(A),XP(b)
        • S(a);N_GUARD::QAR2(A)
        • P(e);::QAR1(A),XP(b)
      • Refutation
        • K(c);S_FLIGHT,XR(D)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A),XP(b)
    • Vars
      • K(c);S_FLIGHT,XR(D)::S(F)
      • K(c);P-FLIGHT,P_SPINP(b)::R(D)
      • B(f);SBLOCK::S(F)
      • S(a);N_GUARD::QAR2(A),XS(a)
      • S(a);N_GUARD::QAR2(A)
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