MESON Chess Problem Database

Problem Display
PID: 178338 (8/2p5/Qpk1K3/8/3P4/8/p1p5/R7 w - - 0 1)

Junker, Karl

Ostdeutsche Morgenpost, 1925

8/2p5/Qpk1K3/8/3P4/8/p1p5/R7

#2

4 + 5

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...c1Q
      • 2.Rxc1#
    • 1...c1S
      • 2.Rxc1#
    • 1...c1B
      • 2.Rxc1#
    • 1...c1R
      • 2.Rxc1#
  • Tries
    • 1.Qa4+?
      • 1...b5
        • 2.Qa6#
      • 1...Kb7!
  • Keys
    • 1.Qxa2!
      • threat
        • 2.Qd5#
      • 1...Kb5
        • 2.Qa4#
      • 1...Kb7
        • 2.Qa8#
      • 1...b5
        • 2.Qa6#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • P(b);OGATEB::R(A),XQ(b)
    • P(b);OGATEB::R(A),XS(b)
    • P(b);OGATEB::R(A),XB(b)
    • P(b);OGATEB::R(A),XR(b)
  • Tries
    • Try
      • Q(C);CHECK,N_PINP(c)
      • Vars
        • P(c);OGATEB,P_SPINP(c)::QAR2(C)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • Q(C);N_PINP(c),XP(a)
    • Threat
      • QAB1(C)
    • Vars
      • K(d);S_FLIGHT::QAB1(C)
      • P(c);OGATEB::QAR2(C)
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