MESON Chess Problem Database

Problem Display
PID: 26333 (8/8/2N2p2/2P1p3/Qp2k3/1K2B2P/2N2P2/1B6 w - - 0 1)

Townsend, Alonzo

Source?, 0000

8/8/2N2p2/2P1p3/Qp2k3/1K2B2P/2N2P2/1B6

#2

9 + 4

1693 English Chess Problems 1876

SOLUTION

  • SOUND
  • Sets
    • 1...Kd3
      • 2.S2d4#
    • 1...Kf5
      • 2.S2d4#
  • Tries
    • 1.Kc4?
      • threat
        • 2.Se1#
        • 2.S2d4#
      • 1...Kf5
        • 2.S2d4#
      • 1...Kf3!
    • 1.S6xb4?
      • threat
        • 2.Se1#
        • 2.Sd4#
      • 1...Kf5
        • 2.Sd4#
      • 1...Kf3!
    • 1.S6d4?
      • threat
        • 2.Sxb4#
      • 1...Kd3
        • 2.Sa1#
        • 2.Se1#
        • 2.Sa3#
        • 2.Sxb4#
      • 1...Kd5
        • 2.Qc6#
      • 1...exd4!
    • 1.Se7?
      • threat
        • 2.Se1#
        • 2.Sd4#
      • 1...Kd3
        • 2.Sd4#
      • 1...Kf3!
    • 1.Qxb4+?
      • 1...Kd3
        • 2.S2d4#
        • 2.Qc4#
      • 1...Kf3
        • 2.Qg4#
      • 1...Kf5
        • 2.S2d4#
        • 2.Qg4#
      • 1...Kd5!
  • Keys
    • 1.Qa8!
      • 1...Kd3
        • 2.S2d4#
      • 1...Kf3
        • 2.S6d4#
      • 1...Kd5
        • 2.Sd8#
      • 1...Kf5
        • 2.S2d4#
      • 1...f5
        • 2.S6xb4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(b);N_SPINP(a),S_FLIGHT::B(A)+S(B)
    • K(b);N_SPINP(a),S_FLIGHT::B(A)+S(B),DCHECK
  • Tries
    • Try
      • K(D);N_PINP(a),S_FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • K(b);S_FLIGHT::B(A)+S(B),DCHECK
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(I);XP(a)
      • Threat
        • DUALS(2)
      • Vars
        • K(b);S_FLIGHT::B(A)+S(B),DCHECK
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(I);N_PINP(a)
      • Threat
        • B(A)+S(B),XP(a)
      • Vars
        • K(b);S_FLIGHT::QAB1(G)
      • Refutation
        • P(c);XS(I)
    • Try
      • S(I);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);N_SPINP(a),S_FLIGHT::B(A)+S(B)
      • Refutation
        • K(b);N_SPINP(a),S_FLIGHT
    • Try
      • Q(G);CHECK,XP(a)
      • Vars
        • K(b);OGATE,S_FLIGHT::QAB1(G)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(G);N_PINP(a)
    • Vars
      • K(b);S_FLIGHT::B(A)+S(B)
      • K(b);S_FLIGHT::QAB(G)+S(I),DCHECK
      • K(b);S_FLIGHT::QAB(G)+S(I)
      • K(b);S_FLIGHT::B(A)+S(B),DCHECK
      • P(d);SBLOCK::QAB(G)+S(I),XP(a)
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