MESON Chess Problem Database

Problem Display
PID: 99277 (3NBr2/1p2kP1N/1B1p3K/4q3/3Q3P/2p5/4R3/4r3 w - - 0 1)

Loewenton, Leon

Magyar Sakkelet, 1955

3NBr2/1p2kP1N/1B1p3K/4q3/3Q3P/2p5/4R3/4r3

#2

9 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe2
      • 2.Qf6#
    • 1...Qe3+
      • 2.Qxe3#
    • 1...Qe4
      • 2.Qf6#
      • 2.Qxe4#
    • 1...Qe6+
      • 2.Qf6#
    • 1...d5
      • 2.Qc5#
      • 2.Qxe5#
      • 2.Qb4#
  • Tries
    • 1.Rxe5+?
      • 1...dxe5
        • 2.Bc5#
        • 2.Qc5#
        • 2.Qb4#
        • 2.Qd7#
      • 1...Rxe5!
    • 1.Qc4?
      • threat
        • 2.Qc7#
      • 1...Qe6+
        • 2.Qxe6#
      • 1...Rxf7
        • 2.Qxf7#
      • 1...Qe3+!
    • 1.Qg4?
      • threat
        • 2.Qd7#
        • 2.Qg5#
      • 1...Qe3+
        • 2.Qg5#
      • 1...Qe6+
        • 2.Qxe6#
      • 1...Rxe2
        • 2.Qd7#
      • 1...Rxf7
        • 2.Qd7#
      • 1...d5
        • 2.Qd7#
        • 2.Qb4#
      • 1...Rf1
        • 2.Qd7#
      • 1...Rg1
        • 2.Qd7#
      • 1...Rg8
        • 2.Qd7#
      • 1...Rxe8!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Qxb7#
      • 1...Qe3+
        • 2.Qg5#
      • 1...Qe6+
        • 2.Qxe6#
      • 1...Rxf7
        • 2.Qxf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • Q(c);N_SPINQ(c),OGATE,XR(A)::QAB1(B)
    • Q(c);CHECK,OGATEB::QAR(B),XQ(c)
    • Q(c);CHECK,OGATE::QAB1(B)
  • Tries
    • Try
      • R(A);CHECK,XQ(c)
      • Refutation
        • R(a);XR(A)
    • Try
      • Q(B);
      • Threat
        • QAR2(B)
      • Vars
        • Q(c);CHECK,N_GUARD::QAR1(B),XQ(c)
        • R(g);OGATE,XP(F)::QAR1(B),XR(g)
      • Refutation
        • Q(c);CHECK
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);CHECK::QAB(B)
        • Q(c);CHECK,N_GUARD::QAR1(B),XQ(c)
        • R(a);N_SPINQ(c),XR(A)::QAR1(B)
        • R(g);XP(F)::QAR1(B)
        • R(a);::QAR1(B)
        • R(g);::QAR1(B)
      • Refutation
        • R(g);XB(I)
  • Actual
    • Q(B);
    • Threat
      • QAR(B),XP(e)
    • Vars
      • Q(c);CHECK,OGATE::QAB(B)
      • Q(c);CHECK,N_GUARD::QAR1(B),XQ(c)
      • R(g);OGATE,XP(F)::QAR1(B),XR(g)
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