MESON Chess Problem Database

Problem Display
PID: 120720 (8/4Q3/2p5/1p1k1P2/3n4/3R4/5K2/8 w - - 0 1)

Scheel, Johan

Morgenbladet, 1916

8/4Q3/2p5/1p1k1P2/3n4/3R4/5K2/8

#2

4 + 4

6490 yacpdb 2009
5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...c5
      • 2.Qe6#
  • Tries
    • 1.Ke3?
      • threat
        • 2.Rxd4#
      • 1...c5
        • 2.Qe6#
      • 1...Kc4!
    • 1.Qc5+?
      • 1...Ke4
        • 2.Rxd4#
      • 1...Kxc5!
    • 1.Qe3?
      • threat
        • 2.Qxd4#
      • 1...Kc4
        • 2.Qxd4#
      • 1...Kc5
        • 2.Qxd4#
      • 1...c5
        • 2.Qe6#
      • 1...Kd6!
    • 1.Qe5+?
      • 1...Kc4
        • 2.Qxd4#
      • 1...Kxe5!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Qxd4#
      • 1...Kc4
        • 2.Qxd4#
      • 1...Ke4
        • 2.Rxd4#
      • 1...Kc5
        • 2.Qxd4#
      • 1...c5
        • 2.Qe6#

This anticipates 172384(1997)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(d);SBLOCK::QAB1(D)
  • Tries
    • Try
      • K(A);S_FLIGHT
      • Threat
        • R1(B),XS(a)
      • Vars
        • P(d);SBLOCK::QAB1(D)
      • Refutation
        • K(c);N_SPINS(a),S_FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(c);N_SPINS(a),S_FLIGHT::R1(B),XS(a)
      • Refutation
        • K(c);N_SPINS(a),P-FLIGHT,XQ(D)
    • Try
      • Q(D);
      • Threat
        • QAR1(D),XS(a)
      • Vars
        • K(c);N_SPINS(a),S_FLIGHT::QAR1(D),XS(a)
        • K(c);P-FLIGHT::QAB1(D),XS(a)
        • P(d);SBLOCK::QAB1(D)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(c);N_SPINS(a),S_FLIGHT::QAR1(D),XS(a)
      • Refutation
        • K(c);N_SPINS(a),P-FLIGHT,XQ(D)
  • Actual
    • Q(D);
    • Threat
      • QAR1(D),XS(a)
    • Vars
      • K(c);N_SPINS(a),S_FLIGHT::QAR1(D),XS(a)
      • K(c);N_SPINS(a),S_FLIGHT::R1(B),XS(a)
      • K(c);N_SPINS(a),P-FLIGHT::QAB1(D),XS(a)
      • P(d);SBLOCK::QAB1(D)
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