MESON Chess Problem Database

Problem Display
PID: 235570 (8/4K3/N6B/1n2p2R/Q2qk3/3R4/4B3/8 w - - 0 1)

Hannelius, Jan Ingvar

Freie Presse, 1976

8/4K3/N6B/1n2p2R/Q2qk3/3R4/4B3/8

#2

7 + 4

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Bf3#
    • 1...Qxa4
      • 2.Sc5#
    • 1...Qb4+
      • 2.Sc5#
    • 1...Qc4
      • 2.Sc5#
  • Tries
    • 1.Rxd4+?
      • 1...exd4
        • 2.Sc5#
      • 1...Sxd4!
    • 1.Rh4+?
      • 1...Kd5
        • 2.Qxb5#
      • 1...Kf5!
    • 1.Qxd4+?
      • 1...exd4
        • 2.Sc5#
      • 1...Sxd4!
  • Keys
    • 1.Qc2!
      • threat
        • 2.Bf3#
      • 1...Qc5+
        • 2.Sxc5#
      • 1...Qa7+
        • 2.Rd7#
      • 1...Qb4+
        • 2.Rd6#
      • 1...Qd6+
        • 2.Rxd6#
      • 1...Qd7+
        • 2.Rxd7#
      • 1...Qd8+
        • 2.Rxd8#
      • 1...Kd5
        • 2.Bf3#
      • 1...Qxd3
        • 2.Qxd3#
      • 1...Qf2
        • 2.Rd1#
        • 2.Rd2#
        • 2.Rd6#
        • 2.Rd7#
        • 2.Rd8#
        • 2.Qc6#
      • 1...Qe3
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 2
  • Sets
    • K(b);P_SPINP(d),S_FLIGHT::B(A)
    • Q(a);N_SPINQ(a),XQ(C)::S(E)
    • Q(a);CHECK::S(E)
    • Q(a);::S(E)
  • Tries
    • Try
      • R(B);CHECK,XQ(a)
      • Vars
        • P(d);P_SPINP(d),XR(B)::S(E)
      • Refutation
        • S(c);P_SPINS(c),XR(B)
    • Try
      • R(D);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR2(C),XS(c)
      • Refutation
        • K(b);N_SPINQ(a),S_FLIGHT
    • Try
      • Q(C);CHECK,XQ(a)
      • Vars
        • P(d);XQ(C)::S(E)
      • Refutation
        • S(c);XQ(C)
  • Actual
    • Q(C);N_PINQ(a)
    • Threat
      • B(A)
    • Vars
      • Q(a);CHECK,N_GUARD::S(E),XQ(a)
      • Q(a);CHECK,OGATE::QAB(C)+R(B)
      • Q(a);CHECK,OGATE::QAB(C)+R(B),XQ(a)
      • K(b);P_SPINP(d),P_SPINQ(a),S_FLIGHT::B(A)
      • Q(a);OGATE,P_SPINQ(a),XR(B)::QAB1(C),XQ(a)
      • Q(a);N_GUARD::QAB(C)
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